The fix for this issue is now available in the latest update of InDesign – that is, InDesign 15.0.3.
Please update your InDesign application to get the fix.
Adobe InDesign team
An error occurred while saving the commentAnonymous commented
Using v15.1.2 - the spell check doesn't even give me a couple of words any more - click on spell check and crash... this has been happening for months - it must be a bug?! what's the situation?