Problems on fretta server - tried to use a NULL entity

Recently, my fretta server start crashing and work incorrectly.
Gamemodes start to give out errors - “Tried to use a NULL entity”.
And then server crash with “No free edicts” error
This error don’t appear every time - sometimes everything is OK.
It has caused problems - no zombies on zombie onslaught, no flag spawn on capture the flag, spawn in walls in garry ware etc.
I can’t get it - why this problem appears.
The only thing i did - added one bot on map load, then auto-kick him after 10 seconds.

Here is typical daily error log:

Solved this problem - removed bot :frowning: but timers is now frozen at server start…