diff --git a/include/Webservices/Utils.php b/include/Webservices/Utils.php
index d398829087a429ea2bd2a71d5a415e109f005d8b..2c3c6871de1fa02c95ccc25d3f4365ffd2c3fca7 100644
--- a/include/Webservices/Utils.php
+++ b/include/Webservices/Utils.php
@@ -117,7 +117,7 @@ function vtws_getUserWebservicesGroups($tabId,$user){
 }
 
 function vtws_getIdComponents($elementid){
-	return explode("x",$elementid);
+	return explode("x",(string)$elementid);
 }
 
 function vtws_getId($objId, $elemId){
diff --git a/layouts/v7/modules/Vtiger/AdvanceFilter.tpl b/layouts/v7/modules/Vtiger/AdvanceFilter.tpl
index d3ba3e864dfb5800ae26227fbea775fddf1602c3..50048b7f079d502e7df625543de21896fb50f65e 100644
--- a/layouts/v7/modules/Vtiger/AdvanceFilter.tpl
+++ b/layouts/v7/modules/Vtiger/AdvanceFilter.tpl
@@ -10,8 +10,8 @@
  ********************************************************************************/
 -->*}
 {strip}
-	{assign var=ALL_CONDITION_CRITERIA value=$ADVANCE_CRITERIA[1] }
-	{assign var=ANY_CONDITION_CRITERIA value=$ADVANCE_CRITERIA[2] }
+	{assign var=ALL_CONDITION_CRITERIA value=(isset($ADVANCE_CRITERIA[1])?$ADVANCE_CRITERIA[1]:[])}
+	{assign var=ANY_CONDITION_CRITERIA value=(isset($ADVANCE_CRITERIA[2])?$ADVANCE_CRITERIA[2]:[])}
 
 	{if empty($ALL_CONDITION_CRITERIA) }
 		{assign var=ALL_CONDITION_CRITERIA value=array()}
@@ -37,9 +37,11 @@
 		</div>
 		<div class="contents">
 			<div class="conditionList">
+			{if isset($ALL_CONDITION_CRITERIA['columns'])}
 			 {foreach item=CONDITION_INFO from=$ALL_CONDITION_CRITERIA['columns']}
 				{include file='AdvanceFilterCondition.tpl'|@vtemplate_path:$QUALIFIED_MODULE RECORD_STRUCTURE=$RECORD_STRUCTURE CONDITION_INFO=$CONDITION_INFO MODULE=$MODULE}
 			{/foreach}
+			{/if}
 			{if php7_count($ALL_CONDITION_CRITERIA) eq 0}
 				{include file='AdvanceFilterCondition.tpl'|@vtemplate_path:$QUALIFIED_MODULE RECORD_STRUCTURE=$RECORD_STRUCTURE MODULE=$MODULE CONDITION_INFO=array()}
 			{/if}
@@ -51,11 +53,13 @@
 				<button type="button" class="btn btn-default"><i class="fa fa-plus"></i>&nbsp;&nbsp;{vtranslate('LBL_ADD_CONDITION',$MODULE)}</button>
 			</div>
 			<div class="groupCondition">
+			{if isset($ALL_CONDITION_CRITERIA['condition'])}
 				{assign var=GROUP_CONDITION value=$ALL_CONDITION_CRITERIA['condition']}
 				{if empty($GROUP_CONDITION)}
 					{assign var=GROUP_CONDITION value="and"}
 				{/if}
 				<input type="hidden" name="condition" value="{$GROUP_CONDITION}" />
+			{/if}
 			</div>
 		</div>
 	</div>
@@ -67,9 +71,11 @@
 		</div>
 		<div class="contents">
 			<div class="conditionList">
+			{if isset($ANY_CONDITION_CRITERIA['columns'])}
 			{foreach item=CONDITION_INFO from=$ANY_CONDITION_CRITERIA['columns']}
 				{include file='AdvanceFilterCondition.tpl'|@vtemplate_path:$QUALIFIED_MODULE RECORD_STRUCTURE=$RECORD_STRUCTURE CONDITION_INFO=$CONDITION_INFO MODULE=$MODULE CONDITION="or"}
 			{/foreach}
+			{/if}
 			{if php7_count($ANY_CONDITION_CRITERIA) eq 0}
 				{include file='AdvanceFilterCondition.tpl'|@vtemplate_path:$QUALIFIED_MODULE RECORD_STRUCTURE=$RECORD_STRUCTURE MODULE=$MODULE CONDITION_INFO=array() CONDITION="or"}
 			{/if}
diff --git a/layouts/v7/modules/Vtiger/ModuleRelatedTabs.tpl b/layouts/v7/modules/Vtiger/ModuleRelatedTabs.tpl
index eb103a24c3c872ef279db739d0fc0c4c03052a09..0f148239c95c315e09db55d50f98c7030c8eb767 100644
--- a/layouts/v7/modules/Vtiger/ModuleRelatedTabs.tpl
+++ b/layouts/v7/modules/Vtiger/ModuleRelatedTabs.tpl
@@ -29,7 +29,9 @@
 						</li>
 					{/foreach}
 
-					{assign var=RELATEDTABS value=$DETAILVIEW_LINKS['DETAILVIEWRELATED']}
+                                        {if isset($DETAILVIEW_LINKS['DETAILVIEWRELATED'])}
+					        {assign var=RELATEDTABS value=$DETAILVIEW_LINKS['DETAILVIEWRELATED']}
+                                        {/if}
                                         {if !empty($RELATEDTABS)}
                                             {assign var=COUNT value=$RELATEDTABS|@count}
 
diff --git a/modules/CustomView/actions/Save.php b/modules/CustomView/actions/Save.php
index 6900d392f7f100c9aa9f3d40b5f5c5f7da12d17a..0d7c1fd8a1f0abcb046877eac481db7ac5a6fca5 100644
--- a/modules/CustomView/actions/Save.php
+++ b/modules/CustomView/actions/Save.php
@@ -16,6 +16,7 @@ class CustomView_Save_Action extends Vtiger_Action_Controller {
 	}
 
 	public function process(Vtiger_Request $request) {
+		$moduleName = $request->get('module');
         $sourceModuleName = $request->get('source_module');
         $moduleModel = Vtiger_Module_Model::getInstance($sourceModuleName);
 		$customViewModel = $this->getCVModelFromRequest($request);
diff --git a/modules/Emails/models/Mailer.php b/modules/Emails/models/Mailer.php
index 8741cdbce83f3def4a4d37c562c7d94bf499ec1e..5cb044a4380d3647d9a832466b3ee9e05bf8cab6 100644
--- a/modules/Emails/models/Mailer.php
+++ b/modules/Emails/models/Mailer.php
@@ -16,6 +16,7 @@ include_once 'include/database/PearDatabase.php';
 class Emails_Mailer_Model extends Vtiger_Mailer {
 
 	private $dom = null;
+	public $Signature;
 
 	public static function getInstance() {
 		return new self();
diff --git a/modules/Quotes/Quotes.php b/modules/Quotes/Quotes.php
index 67ed551f76ca8a09188512c3b4aa2d9a85a9298a..7b57ba6ad0c837fe5f8d0216764ddc22f13967a5 100755
--- a/modules/Quotes/Quotes.php
+++ b/modules/Quotes/Quotes.php
@@ -127,7 +127,7 @@ class Quotes extends CRMEntity {
 		}
 		$_REQUEST['ajxaction']=isset($_REQUEST['ajxaction']) ? $_REQUEST['ajxaction'] :"";
 		//in ajax save we should not call this function, because this will delete all the existing product values
-		if($_REQUEST['action'] != 'QuotesAjax' && $_REQUEST['ajxaction'] != 'DETAILVIEW'
+		if($_REQUEST['action'] != 'QuotesAjax' && isset($_REQUEST['ajaxaction']) && $_REQUEST['ajxaction'] != 'DETAILVIEW'
 				&& $_REQUEST['action'] != 'MassEditSave' && $_REQUEST['action'] != 'ProcessDuplicates'
 				&& $_REQUEST['action'] != 'SaveAjax' && $this->isLineItemUpdate != false) {
 			//Based on the total Number of rows we will save the product relationship with this entity
diff --git a/pkg/vtiger/modules/Import/modules/Import/actions/Data.php b/pkg/vtiger/modules/Import/modules/Import/actions/Data.php
index d4ca1b2ad068eda319f27bab801bc54f974d9690..07bc71fed20b7f0118884b72477db9a95b6b5655 100644
--- a/pkg/vtiger/modules/Import/modules/Import/actions/Data.php
+++ b/pkg/vtiger/modules/Import/modules/Import/actions/Data.php
@@ -408,7 +408,7 @@ class Import_Data_Action extends Vtiger_Action_Controller {
 			}
 			if ($createRecord || $mergeType == Import_Utils_Helper::$AUTO_MERGE_MERGEFIELDS || $mergeType == Import_Utils_Helper::$AUTO_MERGE_OVERWRITE) {
 				$entityIdComponents = vtws_getIdComponents($entityInfo['id']);
-				$recordId = $entityIdComponents[1];
+				$recordId = isset($entityIdComponents[1]) ? $entityIdComponents[1] : '';
 				if (!empty($recordId)) {
 					$entityfields = getEntityFieldNames($this->module);
 					switch ($this->module) {
@@ -433,7 +433,7 @@ class Import_Data_Action extends Vtiger_Action_Controller {
 					$this->entityData[] = VTEntityData::fromCRMEntity($focus);
 				}
 
-				$label = trim($label);
+				$label = isset($label) ? trim($label) : '';
 				$adb->pquery('UPDATE vtiger_crmentity SET label=? WHERE crmid=?', array($label, $recordId));
 				//Creating entity data of updated records for post save events
 				if (in_array($entityInfo['status'], array(self::$IMPORT_RECORD_MERGED, self::$IMPORT_RECORD_UPDATED))) {
diff --git a/pkg/vtiger/modules/Projects/Project/layouts/v7/modules/Project/SelectEmailFields.tpl b/pkg/vtiger/modules/Projects/Project/layouts/v7/modules/Project/SelectEmailFields.tpl
index 0ded0e236a56465280f0e641ee99137823d3af22..fccf3eb079bf8f4934437e33b9e98f4ca9eb27d0 100644
--- a/pkg/vtiger/modules/Projects/Project/layouts/v7/modules/Project/SelectEmailFields.tpl
+++ b/pkg/vtiger/modules/Projects/Project/layouts/v7/modules/Project/SelectEmailFields.tpl
@@ -20,10 +20,10 @@
                     <input type="hidden" name="viewname" value="{$VIEWNAME}" />
                     <input type="hidden" name="module" value="{$MODULE}"/>
                     <input type="hidden" name="view" value="ComposeEmail"/>
-                    <input type="hidden" name="search_key" value= "{$SEARCH_KEY}" />
+                    <input type="hidden" name="search_key" value="{if isset($SEARCH_KEY)}{$SEARCH_KEY}{else}''{/if}"/>
                     <input type="hidden" name="operator" value="{$OPERATOR}" />
-                    <input type="hidden" name="search_value" value="{$ALPHABET_VALUE}" />
-                    {if $SEARCH_PARAMS}
+                    <input type="hidden" name="search_value" value="{if isset($ALPHABET_VALUE)}{$ALPHABET_VALUE}{else}''{/if}" />
+                    {if isset($SEARCH_PARAMS)}
                         <input type="hidden" name="search_params" value='{ZEND_JSON::encode($SEARCH_PARAMS)}' />
                     {/if}
                     <input type="hidden" name="fieldModule" value={$SOURCE_MODULE} />
@@ -77,7 +77,7 @@
                 </div>
                 <div class="preferenceDiv" style="padding: 0px 0px 10px 35px;">
                     <label class="checkbox displayInlineBlock">
-                        <input type="checkbox" name="saveRecipientPrefs" id="saveRecipientPrefs" {if $RECIPIENT_PREF_ENABLED}checked="true"{/if}/>&nbsp;&nbsp;&nbsp;
+                        <input type="checkbox" name="saveRecipientPrefs" id="saveRecipientPrefs" {if isset($RECIPIENT_PREF_ENABLED)}checked="true"{/if}/>&nbsp;&nbsp;&nbsp;
                         {vtranslate('LBL_REMEMBER_MY_PREF',$MODULE)}&nbsp;&nbsp;
                     </label>
                     <i class="fa fa-info-circle" title="{vtranslate('LBL_EDIT_EMAIL_PREFERENCE_TOOLTIP', $MODULE)}"></i>
diff --git a/pkg/vtiger/modules/Projects/Project/modules/Project/Project.php b/pkg/vtiger/modules/Projects/Project/modules/Project/Project.php
index 1ffe087157e17e332de38696f8f1d72fd82bcfe8..eb564ec3659a35bbf2520161691225102c27b62f 100644
--- a/pkg/vtiger/modules/Projects/Project/modules/Project/Project.php
+++ b/pkg/vtiger/modules/Projects/Project/modules/Project/Project.php
@@ -447,7 +447,7 @@ class Project extends CRMEntity {
              parent::delete_related_module($module, $crmid, $with_module, $with_crmid);
              return;
          }
-        $destinationModule = vtlib_purify($_REQUEST['destination_module']);
+		 $destinationModule = isset($_REQUEST['destination_module']) ? vtlib_purify($_REQUEST['destination_module']) : '';
 		if(empty($destinationModule)) $destinationModule = $with_module;
         if (!is_array($with_crmid)) $with_crmid = Array($with_crmid);
         foreach($with_crmid as $relcrmid) {
diff --git a/pkg/vtiger/modules/Projects/Project/modules/Project/models/Record.php b/pkg/vtiger/modules/Projects/Project/modules/Project/models/Record.php
index e3efa04d5a2cc898c862bd7ed3748cbcb4e8602a..344900685bf7186fd01430da54bd2ce5be6b984c 100644
--- a/pkg/vtiger/modules/Projects/Project/modules/Project/models/Record.php
+++ b/pkg/vtiger/modules/Projects/Project/modules/Project/models/Record.php
@@ -91,6 +91,7 @@
 
 		$result = $db->pquery($sql, array($recordId));
 		$i = -1;
+		$projectTasks = array();
 		while($record = $db->fetchByAssoc($result)){
 			$record['id'] = $i;
 			$record['name'] = decode_html(textlength_check($record['name']));
diff --git a/pkg/vtiger/modules/Projects/Project/modules/Project/views/MassActionAjax.php b/pkg/vtiger/modules/Projects/Project/modules/Project/views/MassActionAjax.php
index 5b892168165a188c942a127e158e53f749821282..b55ea0a61a1775013c3f46c9110257417570407f 100644
--- a/pkg/vtiger/modules/Projects/Project/modules/Project/views/MassActionAjax.php
+++ b/pkg/vtiger/modules/Projects/Project/modules/Project/views/MassActionAjax.php
@@ -58,7 +58,7 @@ class Project_MassActionAjax_View extends Vtiger_MassActionAjax_View {
 				if (empty($refModuleEmailFields)) {
 					continue;
 				}
-				$refModuleEmailPrefs = $refModuleEmailPrefs = isset($recipientPrefs[$refModule->getId()]) ? $recipientPrefs[$refModule->getId()] : '';
+				$refModuleEmailPrefs = isset($recipientPrefs[$refModule->getId()]) ? $recipientPrefs[$refModule->getId()] : '';
 				foreach ($refModuleEmailFields as $refModuleEmailField) {
 					if ($refModuleEmailField->isViewable()) {
 						$refModuleEmailField->set('baseRefField', $referenceField->getFieldName());
@@ -120,7 +120,7 @@ class Project_MassActionAjax_View extends Vtiger_MassActionAjax_View {
 					$refModuleModel = Vtiger_Module_Model::getInstance($refModuleName);
 					if (!$refModuleModel || !$refModuleModel->isActive() || !Users_Privileges_Model::isPermitted($refModuleModel->getName(), 'DetailView'))
 						continue;
-					$refModuleEmailPrefs = $recipientPrefs[$refModuleModel->getId()];
+					$refModuleEmailPrefs = isset($recipientPrefs[$refModuleModel->getId()]) ? $recipientPrefs[$refModuleModel->getId()] : '';
 					$refModuleEmailFields = $refModuleModel->getFieldsByType('email');
 					if (empty($refModuleEmailFields))
 						continue;
diff --git a/pkg/vtiger/modules/Projects/ProjectTask/layouts/v7/modules/ProjectTask/SelectEmailFields.tpl b/pkg/vtiger/modules/Projects/ProjectTask/layouts/v7/modules/ProjectTask/SelectEmailFields.tpl
index c3fb8828cf5cea48334fa98f8090ca05a084233f..8a6fc441516bf1f067e7c41cde6a76206d3c6d88 100644
--- a/pkg/vtiger/modules/Projects/ProjectTask/layouts/v7/modules/ProjectTask/SelectEmailFields.tpl
+++ b/pkg/vtiger/modules/Projects/ProjectTask/layouts/v7/modules/ProjectTask/SelectEmailFields.tpl
@@ -20,10 +20,10 @@
                     <input type="hidden" name="viewname" value="{$VIEWNAME}" />
                     <input type="hidden" name="module" value="{$MODULE}"/>
                     <input type="hidden" name="view" value="ComposeEmail"/>
-                    <input type="hidden" name="search_key" value= "{$SEARCH_KEY}" />
+                    <input type="hidden" name="search_key" value="{if isset($SEARCH_KEY)}{$SEARCH_KEY}{else}''{/if}"/>
                     <input type="hidden" name="operator" value="{$OPERATOR}" />
-                    <input type="hidden" name="search_value" value="{$ALPHABET_VALUE}" />
-                    {if $SEARCH_PARAMS}
+                    <input type="hidden" name="search_value" value="{if isset($ALPHABET_VALUE)}{$ALPHABET_VALUE}{else}''{/if}" />
+                    {if isset($SEARCH_PARAMS)}
                         <input type="hidden" name="search_params" value='{ZEND_JSON::encode($SEARCH_PARAMS)}' />
                     {/if}
                     <input type="hidden" name="fieldModule" value={$SOURCE_MODULE} />
@@ -77,7 +77,7 @@
                 </div>
                 <div class="preferenceDiv" style="padding: 0px 0px 10px 35px;">
                     <label class="checkbox displayInlineBlock">
-                        <input type="checkbox" name="saveRecipientPrefs" id="saveRecipientPrefs" {if $RECIPIENT_PREF_ENABLED}checked="true"{/if}/>&nbsp;&nbsp;&nbsp;
+                        <input type="checkbox" name="saveRecipientPrefs" id="saveRecipientPrefs" {if isset($RECIPIENT_PREF_ENABLED)}checked="true"{/if}/>&nbsp;&nbsp;&nbsp;
                         {vtranslate('LBL_REMEMBER_MY_PREF',$MODULE)}&nbsp;&nbsp;
                     </label>
                     <i class="fa fa-info-circle" title="{vtranslate('LBL_EDIT_EMAIL_PREFERENCE_TOOLTIP', $MODULE)}"></i>
diff --git a/pkg/vtiger/modules/Projects/ProjectTask/modules/ProjectTask/ProjectTask.php b/pkg/vtiger/modules/Projects/ProjectTask/modules/ProjectTask/ProjectTask.php
index 88706e27c37d835e7f332f8b49816505c1c3c299..931aa6c2d5fdea6ec46b1ced1d3b5bd8e150961d 100644
--- a/pkg/vtiger/modules/Projects/ProjectTask/modules/ProjectTask/ProjectTask.php
+++ b/pkg/vtiger/modules/Projects/ProjectTask/modules/ProjectTask/ProjectTask.php
@@ -474,7 +474,7 @@ class ProjectTask extends CRMEntity {
 		require_once "modules/$relModuleName/$relModuleName.php";
 		$relModuleFocus = new $relModuleName();
 		vtlib_setup_modulevars($relModuleName, $relModuleFocus);
-
+		$button = '';
 
 		$returnSet = '&return_module='.$currentModule.'&return_action=CallRelatedList&return_id='.$recordId;
 
diff --git a/pkg/vtiger/modules/Projects/ProjectTask/modules/ProjectTask/views/MassActionAjax.php b/pkg/vtiger/modules/Projects/ProjectTask/modules/ProjectTask/views/MassActionAjax.php
index ed91bbae6c9d7b7c10f4f4db1c5ee25d1692c562..5ae7b1b73db2b971c550b447dbf5be1e3a123263 100644
--- a/pkg/vtiger/modules/Projects/ProjectTask/modules/ProjectTask/views/MassActionAjax.php
+++ b/pkg/vtiger/modules/Projects/ProjectTask/modules/ProjectTask/views/MassActionAjax.php
@@ -16,10 +16,11 @@ class ProjectTask_MassActionAjax_View extends Project_MassActionAjax_View {
 		//get parent email fields and their reference email fields
 		$moduleModel = Vtiger_Module_Model::getInstance('Project');
 		$recipientPrefModel = Vtiger_RecipientPreference_Model::getInstance($sourceModule);
+		$recipientPrefs = array();
 
 		if ($recipientPrefModel)
 			$recipientPrefs = $recipientPrefModel->getPreferences();
-		$moduleEmailPrefs = $recipientPrefs[$moduleModel->getId()];
+		$moduleEmailPrefs = isset($recipientPrefs[$moduleModel->getId()]) ? $recipientPrefs[$moduleModel->getId()] : '';
 		$emailAndRefFields = $moduleModel->getFieldsByType(array('email', 'reference'));
 		$accesibleFields = array();
 		$referenceFieldValues = array();
@@ -58,7 +59,7 @@ class ProjectTask_MassActionAjax_View extends Project_MassActionAjax_View {
 				if (empty($refModuleEmailFields)) {
 					continue;
 				}
-				$refModuleEmailPrefs = $recipientPrefs[$refModule->getId()];
+				$refModuleEmailPrefs = isset($recipientPrefs[$refModule->getId()]) ? $recipientPrefs[$refModule->getId()] : '';
 				foreach ($refModuleEmailFields as $refModuleEmailField) {
 					if ($refModuleEmailField->isViewable()) {
 						$refModuleEmailField->set('baseRefField', $referenceField->getFieldName());
@@ -120,7 +121,7 @@ class ProjectTask_MassActionAjax_View extends Project_MassActionAjax_View {
 					$refModuleModel = Vtiger_Module_Model::getInstance($refModuleName);
 					if (!$refModuleModel || !$refModuleModel->isActive() || !Users_Privileges_Model::isPermitted($refModuleModel->getName(), 'DetailView'))
 						continue;
-					$refModuleEmailPrefs = $recipientPrefs[$refModuleModel->getId()];
+						$refModuleEmailPrefs = isset($recipientPrefs[$refModuleModel->getId()]) ? $recipientPrefs[$refModuleModel->getId()] : '';
 					$refModuleEmailFields = $refModuleModel->getFieldsByType('email');
 					if (empty($refModuleEmailFields))
 						continue;