We have the fix available in the latest release. Please update Illustrator using Adobe Creative Cloud application to the latest build for version Illustrator CC 22.1.
Please refer to our knowledge base FAQ – https://illustrator.uservoice.com/knowledgebase/articles/1844590 if you face difficulty in update.
Or get in touch with us at any of the other support channels – https://helpx.adobe.com/support.html
Ashutosh Chaturvedi | Sr. Quality Engineering Manager – Illustrator
Adobe. Make It an Experience.Sarah commented
Mine is doing this too. I press ESC to dismiss the dialog box but if I try to adjust kerning again, Illustrator crashes. I've lost work on the same file twice because I forget that KERNING DOESN'T WORK. Just for the record, I do have automatic data recovery turned on but I can't set it up to save constantly—it slows everything down.