On Saturday, 8 June 2019 at 20:44:13 UTC, Steven Schveighoffer
On 6/8/19 2:28 AM, Amex wrote:
On Friday, 7 June 2019 at 16:09:47 UTC, Adam D. Ruppe wrote:
It happens when I close down my app.
is this inside a destructor?
No, it's in an external thread(it is in a callback). All I can
think of is that something is happening in between the two
checks since there is no way it could happen otherwise.
Possible the GC cleaned up the object already. When this
happens, you get this kind of behavior (the GC intentionally
sets the vtable to null to prevent invalid access).
Try GC.addRef on the X reference, and see if it helps.
This is during shutdown so I imagine simply turning off the GC
should work fine? That way it prevents all cases rather than
having to add a bunch of specific cases each time they crop up.