Okay, I am back from my travels. Looking more closely at this, and instead of skipping svgs in get_image_metadata_alttext, I will instead alter that routine to handle svg first by reading in the svg and then parsing it for the contents of the top level (first) desc tag.
That should prevent the crashes while still giving svg with desc tag info a chance to initialize their alt strings.
Once I get it tested I will post a new version of Access-Aide with this change.
Thanks so much to BeckyEbook for tracking down the failure and making a fix!
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