problem

User "Alice" imports a task into translate5 is therefore getting used as PM for that task.

User "Bob" deletes "Alice" since "Alice" is fired or something similar.

"Alice" is deleted from the user table, but remains PM for that task.

Mostly this is no problem, only if some special workflows relay on the existence of the PM this is leading to errors.

Check all usages of "editor_Workflow_Notification->getTaskPmUsers()" to get possible affected places.

ways to solve

Define how PMs of task should be replaced if such user is getting deleted. Or should a user holding tasks not be deleteable?