Creating event from Contact with No organization linked

When trying to create an event related to a Contact which doesn't have an Accont, this gives an error. To replicate the error, create a related event in the full form (not the quickcreate) and if you dont link an account you'll get the error: Record your are trying to access is not found. This issue is mainly because there is a contraint in the vtiger_seactivityrel table to where the CRMID must exist. Vtiger tries to insert a row with CRMID = 0 because there is no Account connected. This issue cannot be fixed unless this foreign key is removed. I'll wait for clarifications, thanks.