What is going ooon?!

[Noobnew]

I made a map for fun and I made a huge endless waves of undead attacking "Dalaran" then after like, 1 minute or so, this happened? I have the 1.30 version

Is there something I can do to fix it?

 

[A]mun]

Most probably a faulty imported model (bone parents not set properly iirc).
Or too many polygons on screen (too high quality models), tilted camera like yours can be prone to that.

Thus check if it happens with default camera view, if so, move some imported models out of the way and try again.

 

[Wlizer]

This happens simply when you have too much units created within unit create unit trigger. Some of the unit polygon coordinate values gets zero valued and thats why you see them have long texture spikes coming out of them. Engine isn't made to handle roughtly more than 1200 units (every 12 player have 100 units).

Count your map unit count at the time when clitch occur and then reduce them manual or with the trigger to have a limit before the break happens. I would say its something between 1200-1500.

NOTE:
There is also limit for amount of corpses in the game and it's possible that corpses are counted as units.

 

[Ravager16829]

There's someone who posted similar problem like yours in this thread below:

[HELP] Screen Crashing !

when i create too many unit in same screen ,it will be display error. can some one tell me how to fix this problem? (engine limit?)

www.hiveworkshop.com

Aside from the game engine limitation the guy mentioned, it could be related to your weak system (PC). Especially the graphics card and memory. Weak system had always unable to handle this situation and could result in an unexpected problems with your system (notably BSOD).
Generally, having too many units present in-game (and even World Editor) might led to the display error.