diff --git a/frappe/chat/doctype/chat_room/chat_room.py b/frappe/chat/doctype/chat_room/chat_room.py
index b5873fa2d0..44a6ce0f0b 100644
--- a/frappe/chat/doctype/chat_room/chat_room.py
+++ b/frappe/chat/doctype/chat_room/chat_room.py
@@ -72,8 +72,9 @@ class ChatRoom(Document):
 	def on_update(self):
 		if not self.is_new():
 			before = self.get_doc_before_save()
-			after  = self
+			if not before: return
 
+			after  = self
 			diff   = dictify(get_diff(before, after))
 			if diff:
 				update = { }