On Saturday, 8 June 2019 at 20:44:13 UTC, Steven Schveighoffer wrote:
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.

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