As requested in the log message, I'm reporting this:

FreedroidRPG 0.16-410-g7d8504e_mod encountered a problem in function:
find_free_floor_index
The item array for level 59 was full.


I got the same messages for level 52 too.
It is easy to replicate, just go through hell fortress while invisible and leave
most enemies alive.
When the firmware is updated (quest "Propagating a faulty firmware update") the
bots will die, drop stuff, and cause a lot of these messages to pop up in the
console.

Also, for unknown reasons it dropped some loot in unreachable places, like the
space around the update server room. (between the inner and outer red walls)