I had performed one merge of the Passage Lists from two Syntax searches. Just after I initiated the second merge Logos crashed.
I enclose the Indexer log because it had been waiting for me to close Logos for some time.
7450.MergeCrash.zip
EDIT:
On restart Logos opened to a blank Layout but my Setting is to open the most recent Local layout, and there was an Application Closed layout from several hours ago (10.15 am).