[GNC] custom .chk file crashes GnuCash 3.4

[Mike stagl]

Gnucash 3.4 on Debian 9

I have been using a custom check format (.chk) file I wrote for GnuCash
3.2.  It worked fine until I upgraded to 3.4.  When I go to File->Print 
Checks, GnuCash 3.4 crashes before the dialog box even opens.

If I delete the custom .chk file and open GnuCash 3.4, it will print a
default check format fine.

I rolled back to GnuCash 3.2 and my custom file prints fine.

Did anything change with 3.4 that I would need to modify in my .chk
file?

Thanks to all the contributors,

Mike