Garrysmod server crashes often ( crash dump inside )

Hello! I run a 32 slots darkrp server and it crashes often and the crash dump shows this:

  • You crashed in lua_shared.dll with the failure SOFTWARE_NX_FAULT_INVALID_c0000005_lua_shared.dll!Unknown on Sun Feb 26 20:49:10.000 2012
  • You were using 33 % of your memory

I aint got clue how to fix this or what it means.