FM v13.0.3.494 crashes updating book with unresolved external cross-references

I have just submitted bug #4140392 on a crash updating a book with unresolved external cross-references.

I was trying to test the self-consistency message that people have reported with the new update. The book I started to test is structured and has numerous unresolved xrefs. FM crashed while performing the update. I tried again turning off the option to update xrefs during the update. FM still crashed.

I then created an unstructured book with one file. The file contains three pgfs, each containing an xref to a file I then renamed so that the xrefs were unresolved. I updated this new book and FM crashed. When I converted the xrefs to text, the update completed (and there was no self-consistency message).

          --Lynne