I don't have physical access to the machine I was mentioning in comment #1, but I had the owner delete the cache, and the crash went away, so this confirms my suspicion that simple-scan isn't able to gracefully handle a corrupted cache.
That user also confirmed that the problem first happened after a power outage resulted in an abrupt shutdown while they were using simple-scan to scan documents.
I don't have physical access to the machine I was mentioning in comment #1, but I had the owner delete the cache, and the crash went away, so this confirms my suspicion that simple-scan isn't able to gracefully handle a corrupted cache.
That user also confirmed that the problem first happened after a power outage resulted in an abrupt shutdown while they were using simple-scan to scan documents.