Null Reference Exception When Disposing Many Viewers At Once

[Nickprovs]

I have an issue about Vlc.DotNet.

Generic information

• Vlc.DotNet version : 3.0.0
• Vlc.DotNet project used : (WPF)
• libvlc version : 3.0.8.0 - x64 + From VLC Media Player Directory
• .net version : 4.5.2
• Project language : C#
• Project build architecture : AnyCPU
• Operating system : Windows 10 x64

Summary

Launched 6-9 (no joke -- that's just the range I tested) RTMP streams in a grid. Then, on button press -- dispose of them. This exception seems to intermittently occur.

• [ X] I confirm that my issue doesn't happen in VLC itself.

If I add a null check in the fire-and-forget action -- I never get the exception again.

[jeremyVignelles]

Hi,
Can you open a PR for this one and #640 ?

Good finding 🙂

[Nickprovs]

Thanks! Added a PR for #639 and #640 .

PR at #641

[jeremyVignelles]

Fixed by #641 in v 3.1.0-develop372