I have a lot of mods installed. Notably in the dependencies of this mod except toxic biters. I updated to latest version of all the mods earlier today and had it generate this error at 5 days 3h5min in-game time. For a while (~40ish minutes?) after updating everything worked fine. I suspect it simply didn't happen to call that function in that time period.
The mod Big-Monsters (1.3.2) caused a non-recoverable error.
Please report this error to the mod author.
Error while running event Big-Monsters::on_nth_tick(3600)
Big-Monsters/control.lua:654: bad argument #1 of 3 to 'insert' (table expected, got nil)
stack traceback:
[C]: in function 'insert'
Big-Monsters/control.lua:654: in function 'get_random_lesser_boss'
Big-Monsters/control.lua:757: in function 'create_biterzilla'
Big-Monsters/control.lua:249: in function 'CreateNewEvent'
Big-Monsters/control.lua:449: in function <Big-Monsters/control.lua:445>
I could share my save and mod folder if you want. I have manually edited some mods to get them to work together. It'd be a couple of GB in size. Let me know if you're interested in that and I'll upload it all.