The talent 15:2 (Loneley Winter) disable the water elementar. So a user, that changed this talent must edit the fightclass before he can play again.
Better: Add (enable/disable Pet) to the settings in the fightclass settings in the general menu, if Pet is enabled in the fightclass profile
Much better: Disable pet summing if it fails. At the moment you try Call pet, Revive pet, Call pet, Revive pet ... and so on. So if Revive has no entry and summon fails, disable summon for the rest of the session or until you detect a new (manual summon) pet