diff --git a/td.go b/td.go
index f5b9730..1d365f7 100644
--- a/td.go
+++ b/td.go
@@ -79,6 +79,8 @@ func ListenTG(c *tdlib.Client) {
 					lastChatTDMsgMux[m.ChatID64] = new(sync.Mutex)
 				}
 				lastChatMsgMux.Unlock()
+			} else {
+				lastChatMsgMux.RUnlock()
 			}
 			for {
 				lastChatTDMsgMux[m.ChatID64].Lock()