Game crash

[VirxEC]

Mod version: 1.3.1

Forge version: 14.23.5.2810

Java version: Java 8

Minecraft version: 1.12.2

What happened? / What did you expect to happen? / How to reproduce? If you place down too many drones (fighter and archer in my case) is causes the game to crash due to ticking entity (event? I forgot.)
This is the crash report