Sorry, I need more information. (I can’t replicate the problem here.)
What IIR mode are you using?
Are you on Windows or macOS?
Is the crash 100% repeatable or intermittent?
If you have a specific system where deleting causes the crash, can you email us the system file? (info (at) our website).
Are you using the IIR filters in the Lake Export multi-band limiter window? (We have just found a bug there.)
Regards,
EA Support