Hi there. I had a similar exception in the past. Mine was caused by a project which got corrupted für whatever reason. I could reproduce my exception by playing around with one specific LFO Parameter.
Empry reset didn’t help in my case
opened up a support ticket at elektron. send it in. got it back a few weeks later. received the information, that it’s a project specific problem, which might have happened during an os upgrade. they said they wrote a fix to circumvent something like this happening in the future