I am not aware of any crash in the sample editor that would have gone undetected for more than 5 years. Please provide the files from the path indicated in the error message on those screenshots, otherwise it will be hard to tell what went wrong without being able to reproduce it here.

Of course, here's the files.

I never reported the bug because it happened so rarely back then, but now it's happening way more often than it used to.
I hope I uploaded the correct file, I don't often report things so this is very new to me

Thanks, that's the corect files. I'm not 100% sure yet but maybe you can confirm if you remember any of the following: Do you remember zooming into a larger sample before trying to zoom out of this sample? If so, was the larger sample replaced by this shorter sample, or was it in another sample slot? Maybe you can pay attention to this while using OpenMPT.

I'm not too sure but I think so, that and zooming out of a larger sample. No it was not replaced here, it was in another slot. It happens so randomly at times, even when only having really short samples, I zoom out and the waveform goes completely blank.
I'll keep in mind the next time this glitch happens to pay attention to what I'm exactly doing when in the sample editor. I will update if I get any info about it.

Okay, I was now able to reproduce the issue with the following steps:

• Load a sample that is long enough to be scrollable when zoomed out
• Zoom out and scroll to the end of the sample
• Go to instrument tab
• Replace the instrument associated with that sample by loading a much shorter sample
• Now go back to the sample tab, and observe the crash

Maybe it's not the exact same steps as you did, but the root cause should be the same.

Okay, this should be fixed in r22973. New test builds should be available from https://builds.openmpt.org/builds/ in a few hours, or you can change the update channel to "Next" in OpenMPT to automatically get the new build once it's ready.