update logic.

internal/rpc/conversation/conversaion.go

@@ -244,7 +244,11 @@ func (c *conversationServer) SetConversations(ctx context.Context, req *pbconver
 		if err != nil {
 			return nil, err
 		}
+		if len(conversationList) != 0 {
 			conversationMap[userID] = conversationList[0]
+		} else {
+			conversationMap[userID] = &dbModel.Conversation{}
+		}
 	}
 
 	var conversation dbModel.Conversation