diff --git a/src/engine/api/geary-conversation-monitor.vala b/src/engine/api/geary-conversation-monitor.vala
index 277ef518..a046e9c2 100644
--- a/src/engine/api/geary-conversation-monitor.vala
+++ b/src/engine/api/geary-conversation-monitor.vala
@@ -795,6 +795,8 @@ public class Geary.ConversationMonitor : BaseObject {
                         conversation.to_string(), removed_id.to_string());
                 }
             }
+            
+            conversation.clear_owner();
         }
         
         // for Conversations that have been removed, don't notify they're trimmed