Exception thrown after calling FFmpegInteropMSS.Dispose()

I'm streaming files in my C# player project, here is related code:

private FFmpegInteropMSS ffmpeg;

private void setMediaStreamSource(string url)
{
    mediaElement.Stop();

    ffmpeg?.Dispose();
    ffmpeg = FFmpegInteropMSS.CreateFFmpegInteropMSSFromUri(url, false, false);
    mediaElement.SetMediaStreamSource(ffmpeg.GetMediaStreamSource());
}

But after calling ffmpeg?.Dispose();, sometimes an exception is thrown, here is the exception info:

0xC0000008 occurred
Message: Exception thrown at 0x25DC764A in Player.exe: 0xC0000008: An invalid handle was specified.
>   avformat-57.dll!tcp_read(URLContext* h, unsigned char* buf, int size) Line 199  C
    avformat-57.dll!retry_transfer_wrapper(URLContext* h, unsigned char* buf, int size, int size_min, int (URLContext*, unsigned char*, int) * transfer_func) Line 326  C
    avformat-57.dll!ffurl_read(URLContext* h, unsigned char* buf, int size) Line 357    C
    avformat-57.dll!http_buf_read(URLContext* h, unsigned char* buf, int size) Line 1161    C
    avformat-57.dll!http_read_stream(URLContext* h, unsigned char* buf, int size) Line 1251 C
    avformat-57.dll!http_read(URLContext* h, unsigned char* buf, int size) Line 1362    C
    avformat-57.dll!retry_transfer_wrapper(URLContext* h, unsigned char* buf, int size, int size_min, int (URLContext*, unsigned char*, int) * transfer_func) Line 326  C
    avformat-57.dll!ffurl_read(URLContext* h, unsigned char* buf, int size) Line 357    C
    avformat-57.dll!fill_buffer(AVIOContext* s) Line 480    C
    avformat-57.dll!avio_r8(AVIOContext* s) Line 532    C
    avformat-57.dll!flv_read_packet(AVFormatContext* s, AVPacket* pkt) Line 805 C
    avformat-57.dll!ff_read_packet(AVFormatContext* s, AVPacket* pkt) Line 672  C
    avformat-57.dll!read_frame_internal(AVFormatContext* s, AVPacket* pkt) Line 1322    C
    avformat-57.dll!av_read_frame(AVFormatContext* s, AVPacket* pkt) Line 1480  C
    FFmpegInterop.dll!FFmpegInterop::FFmpegReader::ReadPacket() Line 45 C++
    FFmpegInterop.dll!FFmpegInterop::MediaSampleProvider::GetNextSample() Line 79   C++
    FFmpegInterop.dll!FFmpegInterop::FFmpegInteropMSS::OnSampleRequested(Windows::Media::Core::MediaStreamSource ^ sender, Windows::Media::Core::MediaStreamSourceSampleRequestedEventArgs ^ args) Line 469 C++

Maybe a race condition has happened?

Start by tracing FFmpegInterop::FFmpegReader::ReadPacket(), MediaSampleProvider::GetNextSample(), and FFmpegInteropMSS::OnSampleRequested() while reproducing repeated media-source changes and disposal. Check whether a sample request can overlap ffmpeg?.Dispose(); done means the sequence no longer produces the invalid-handle exception.