fix StreamFrameQueue when deleting multiple streams with queued prio frames

stream_frame_queue.go

@@ -127,6 +127,9 @@ func (q *streamFrameQueue) RemoveStream(streamID protocol.StreamID) {
 	defer q.mutex.Unlock()
 
 	for i, frame := range q.prioFrames {
+		if frame == nil {
+			continue
+		}
 		if frame.StreamID == streamID {
 			q.byteLen -= frame.DataLen()
 			q.len--

stream_frame_queue_test.go

@@ -395,6 +395,16 @@ var _ = Describe("streamFrameQueue", func() {
 			Expect(frame).To(BeNil())
 		})
 
+		It("deletes multiple prioFrames from different streams", func() {
+			queue.Push(prioFrame1, true)
+			queue.Push(prioFrame2, true)
+			queue.RemoveStream(prioFrame1.StreamID)
+			queue.RemoveStream(prioFrame2.StreamID)
+			frame, err := queue.Pop(1000)
+			Expect(err).ToNot(HaveOccurred())
+			Expect(frame).To(BeNil())
+		})
+
 		It("deletes the map entry", func() {
 			queue.Push(frame1, false)
 			queue.Push(frame2, false)