Teeworlds crashing

Hello everyone, on running teeworlds 0.5.1, entering a server and playing for a few seconds, teeworlds randomly crashes.

I got no idea why this is happening and I haven't seen this bug reported anywhere so I've come here to ask for help, I ran it inside the console and this is what I get:

teeworlds: i830_vtbl.c:555: i830_emit_state: Assertion `get_dirty(state) == 0' failed.

Anyone know what this is and how to fix it?

I'm running fully updated (as of time of posting) ubuntu 8.10, and as I said already the teeworlds version is 0.5.1
If anymore information is required abot hardware then this is what I can tell you:

Intel Celeron D 2.53GHz Processor
768RAM
Intel Extreme Graphics 2 Intergrated Graphics

Thank you for those who will help me with this problem.