Running this on Mac OS 10.11.6
Game runs fine but on Exit I get a crash report pop up.

I have the same thing on Linux:

Not shutting down steam as it is not initialised
Script_Free called
./run.sh: line 3: 1628 Segmentation fault (core dumped) ./Loop_Hero

I have the same problem on Mac mini m1, and 142% CPU usage bug

Same here on Linux 5.10.0-4-amd64 #1 SMP Debian 5.10.19-1 (2021-03-02) x86_64 GNU/Linux
It started appearing on the dungeon map randomly after I researched and added to my deck the card with the archer worms

first line from the report appears a *lot* of times with various index values, size looks the same)
-------------------------
Grid 5, index out of bounds reading [21,12] - size is [21,13]
Attempting to set gamepadcount to 0
Not shutting down steam as it is not initialised
Script_Free called
./run.sh: line 3: 432541 Segmentation fault ./Loop_Hero
-------------------------

Same issue here. (M1 Mac OS 12.3) Disappointing that it's been a year with no fix for this.