CUtlLinkedList overflow (exhausted memory allocator)

Simulacron

L-3: Simulated Member
aa
Feb 17, 2016
313
326
This isn't very important but I'm just want to know what it means.
A few months ago I worked on a map that was really bad in optimisation because you could look over the roofs. When I compiled the map the game loaded the map just for about 3 seconds after that the game crashed and showed the message:
CUtlLinkedList overflow (exhausted memory allocator)
Whats the reasons for this. I can only find Threads for:
Cutllinkedlist overflow! (exhausted index range)