VT8.0.0 Undefined Array key: includes/runtime/LanguageHandler.php on line 135 and 150

When debugging the log gets full of these Warnings...

https://code.vtiger.com/vtiger/vtigercrm/-/blob/master/includes/runtime/LanguageHandler.php#L135

https://code.vtiger.com/vtiger/vtigercrm/-/blob/master/includes/runtime/LanguageHandler.php#L150

Think changing if (!self::$fileExists[$file]) { to if (!isset(self::$fileExists[$file])) { would probably do it (untested).