Plugin crashing FL Studio...

[Lindon]

I have a plugin crashing the end users system, here's the crash log, (our plugin is called: QuadShaper.vst3) - any ideas?

FL Studio (20.8.3.2304) [64Bit] has encountered an error and needs to restart.

Crash log saved to C:\Users\issy6\Documents\Image-Line\FL Studio\Support\Logs\Crash\ folder.

Please use Ctrl+C to copy this message and report to support.

Exception: 
Access violation at address 00007FFAD2105D8A in module 'QuadShaper.vst3'. Read of address FFFFFFFFFFFFFFFF
Callstack: 
00007FFAD2000000:00007FFAD2105D8A: QuadShaper.vst3
00007FFAD2000000:00007FFAD2106F9B: QuadShaper.vst3
00007FFAD2000000:00007FFAD2106CDF: QuadShaper.vst3
00007FFB445D0000:00007FFB445DE858: user32.dll
00007FFB445D0000:00007FFB445DE299: user32.dll
0000000000BD0000:000000000108FAE8: FLEngine_x64.dll
0000000000BD0000:000000000108FB58: FLEngine_x64.dll
0000000000BD0000:0000000001090048: FLEngine_x64.dll
0000000000BD0000:00000000017C7351: FLEngine_x64.dll
00007FF660D20000:00007FF660D23BE7: FL64.exe
00007FF660D20000:00007FF660D2400B: FL64.exe
00007FF660D20000:00007FF660D25287: FL64.exe
00007FFB44DA0000:00007FFB44DB7034: KERNEL32.DLL
00007FFB45390000:00007FFB453E26A1: ntdll.dll```

[yall]

@Lindon stupid question but if you are on windows you have put your vst3 in program comon files vst3? I say this because fl studio esg capricious on custom vst folders.

[Lindon]

@yall yes...so I dont think thats it.

[Lindon]

@Christoph-Hart - is there any way you can look at this? FL Studio is (sadly) an important DAW and my customers aren't going to pay for FX products that don't work correctly on it.

Obviously I can send you the project.

I have already asked the customer, and the beta testers to reduce the buffer size to 256....with some small improvement in crash frequency.

[d.healey]

@Lindon Can you recreate the issue on your own system?

[Lindon]

@d-healey _ our beta testers can recreate it when using a custom table LFO depth control --- sometimes...

[Lindon]

@Lindon okay more tracking down...its the presets.....

trying to quickly load one preset after another will make the plugin crash, in multiple hosts now we've found the problem, its clearly getting into some race condition...

[DanH]

@Lindon I'm also having trouble with changing presets here, with an instrument. Is yours fx or instrument?

[Lindon]

@DanH FX

[DanH]

@Lindon ok, cld be unrelated. I don't get a crash here - but nor do the samplemaps / samples load properly either. Commit from June 27th is when this starts happening for me. 24th June is ok.

[Lindon]

@DanH -- well its solidly crashing here...I added code to "slow the user down" so they cant mash the Preset load button, and that improved things, as did the "std" FL studio answer of "use fixed size buffers"...