It’s a “he” but never mind - I have an unfortunate name.
Did you create that Chain in the 2.1.0-alpha version or in some other version of Audacity?
Is this Chain using the De-Clicker from Updated De-Clicker and new De-esser for speech and Missing features - Audacity Support?
If there are any Chains that crash Audacity or don’t work, please attach them. They should be at ~/Library/Application Support/audacity/Chains.
Gale