[General] possible reasons for crash

[69stehend]

first of all, my question isnt related to any map i am making
i just want to know, what can cause wc3 crash
1. can crashes only be caused by the map script/the triggers, or also by mistakes in object editor for example
2. what script mistakes can cause crashes (nullpointer exceptions, etc...)?
3. which nullpointer exceptions cause crash and which dont?

 

[Spartipilo]

JASS requires to be perfectly written. Any custom script with 1 mistake can make your unplayable.

Infinite loops crashes your game (A unit enters X region, move unit to random point inside the region, will trigger it again, over, and over, and crash).

A huge amount of units

A HUGE amount of leaks

 

[Anachron]

Basically either invalid data(type) declarations or full memory.
These huge units/huge/loop crashes are all based on full memory.