diff --git a/stream/source.go b/stream/source.go
index a98fc9f..3beeddd 100644
--- a/stream/source.go
+++ b/stream/source.go
@@ -80,6 +80,8 @@ type Source interface {
 	// PostEvent 切换到主协程执行当前函数
 	PostEvent(cb func())
 
+	ExecuteSyncEvent(cb func())
+
 	// LastPacketTime 返回最近收流时间戳
 	LastPacketTime() time.Time
 
@@ -484,16 +486,9 @@ func (s *PublishSource) AddSink(sink Sink) {
 }
 
 func (s *PublishSource) RemoveSink(sink Sink) {
-	group := sync.WaitGroup{}
-	group.Add(1)
-
-	s.PostEvent(func() {
+	s.ExecuteSyncEvent(func() {
 		s.doRemoveSink(sink)
-
-		group.Done()
 	})
-
-	group.Wait()
 }
 
 func (s *PublishSource) RemoveSinkWithID(id SinkID) {
@@ -507,19 +502,13 @@ func (s *PublishSource) RemoveSinkWithID(id SinkID) {
 
 func (s *PublishSource) FindSink(id SinkID) Sink {
 	var result Sink
-	group := sync.WaitGroup{}
-	group.Add(1)
-
-	s.PostEvent(func() {
+	s.ExecuteSyncEvent(func() {
 		sink, ok := s.sinks[id]
 		if ok {
 			result = sink
 		}
-
-		group.Done()
 	})
 
-	group.Wait()
 	return result
 }
 
@@ -663,16 +652,9 @@ func (s *PublishSource) Close() {
 	}
 
 	// 同步执行, 确保close后, 主协程已经退出, 不会再处理任何推拉流、查询等任何事情.
-	group := sync.WaitGroup{}
-	group.Add(1)
-
-	s.PostEvent(func() {
+	s.ExecuteSyncEvent(func() {
 		s.DoClose()
-
-		group.Done()
 	})
-
-	group.Wait()
 }
 
 // 解析完所有track后, 创建各种输出流
@@ -886,6 +868,18 @@ func (s *PublishSource) PostEvent(cb func()) {
 	s.mainContextEvents <- cb
 }
 
+func (s *PublishSource) ExecuteSyncEvent(cb func()) {
+	group := sync.WaitGroup{}
+	group.Add(1)
+
+	s.PostEvent(func() {
+		cb()
+		group.Done()
+	})
+
+	group.Wait()
+}
+
 func (s *PublishSource) CreateTime() time.Time {
 	return s.createTime
 }
@@ -897,17 +891,12 @@ func (s *PublishSource) SetCreateTime(time time.Time) {
 func (s *PublishSource) Sinks() []Sink {
 	var sinks []Sink
 
-	group := sync.WaitGroup{}
-	group.Add(1)
-	s.PostEvent(func() {
+	s.ExecuteSyncEvent(func() {
 		for _, sink := range s.sinks {
 			sinks = append(sinks, sink)
 		}
-
-		group.Done()
 	})
 
-	group.Wait()
 	return sinks
 }
 
@@ -924,5 +913,7 @@ func (s *PublishSource) GetStreamEndInfo() *StreamEndInfo {
 }
 
 func (s *PublishSource) ProbeTimeout() {
-	s.TransDemuxer.ProbeComplete()
+	if s.TransDemuxer != nil {
+		s.TransDemuxer.ProbeComplete()
+	}
 }
diff --git a/stream/source_utils.go b/stream/source_utils.go
index 529649a..4fd8663 100644
--- a/stream/source_utils.go
+++ b/stream/source_utils.go
@@ -328,7 +328,7 @@ func LoopEvent(source Source) {
 		}
 
 		var ok bool
-		source.PostEvent(func() {
+		source.ExecuteSyncEvent(func() {
 			source.ProbeTimeout()
 			ok = len(source.OriginTracks()) > 0
 		})