I was using Affinity Publisher on my Apple MacBook Air when it crashed.
Here's what I was doing:
I was creating a 2019 calendar.
My first thought was to create a Master Page with a table layout 7 column wide for days of the week plus 6 rows for dates, 1 row for the name of the month, and one for the days of the week; or a total of 8 rows.
Once I created the master page, I figured I'd create 12 pages from that master, and edit each page for each month.
That didn't work, because I couldn't edit the table on the page.
So plan B became edit the master to be the January Master, then copy that to make a new master for February, etc.
I created the January Master, created the January Page, copied the January Master and edited it to make a February Master, created the February Page, etc.
After I edited the October master to make the November Master, Affinity Publisher crashed (just disappeared completely) when I attempted to create the November page from the November Master.
Of course, I hadn't saved my document yet - but the good news is Affinity say it and allowed me to restore it as soon as I restarted it. In fact, the November page had been created correctly, so the error myst have occurred after that.
Apple crash dump attached
AP CRASH DUMP 9-3-2018 SRB.docx