app/reverse/bridge.go: add timer nil check

app/reverse/bridge.go

@@ -55,9 +55,11 @@ func (b *Bridge) cleanup() {
 			activeWorkers = append(activeWorkers, w)
 		}
 		if w.Closed() {
+			if w.Timer != nil {
 				w.Timer.SetTimeout(0)
 			}
 		}
+	}
 
 	if len(activeWorkers) != len(b.workers) {
 		b.workers = activeWorkers
@@ -166,19 +168,25 @@ func (w *BridgeWorker) handleInternalConn(link *transport.Link) {
 	for {
 		mb, err := reader.ReadMultiBuffer()
 		if err != nil {
+			if w.Timer != nil {
 				if w.Closed() {
 					w.Timer.SetTimeout(0)
 				} else {
 					w.Timer.SetTimeout(24 * time.Hour)
 				}
+			}
 			return
 		}
+		if w.Timer != nil {
 			w.Timer.Update()
+		}
 		for _, b := range mb {
 			var ctl Control
 			if err := proto.Unmarshal(b.Bytes(), &ctl); err != nil {
 				errors.LogInfoInner(context.Background(), err, "failed to parse proto message")
+				if w.Timer != nil {
 					w.Timer.SetTimeout(0)
+				}
 				return
 			}
 			if ctl.State != w.State {