Server Crashing

[Xeronix]

Hi,
I am new to hosting cod2 servers and I am having some trouble with it crashing every day or so.

******* script runtime error *******
removed entity is not an entity: (file 'maps/mp/gametypes/tdm.gsc', line 459)
lpattacknum = attacker getEntityNumber();
*
called from:
(file 'maps/mp/gametypes/_spawnlogic.gsc', line 757)
[[level.spawnlogic_oldCallbackPlayerKilled]](
*
called from:
(file 'maps/mp/gametypes/_callbacksetup.gsc', line 69)
[[level.callbackPlayerKilled]](eInflictor, eAttacker, iDamage, sMeansOfDeath, sWeapon, vDir, sHitLoc, timeOffset, deathAnimDuration);
*
started from:
(file 'maps/mp/gametypes/tdm.gsc', line 844)
waittillframeend;
*
************************************
********************
ERROR: script runtime error
(see console for details)
(file 'maps/mp/gametypes/tdm.gsc', line 844)

********************
----- Server Shutdown -----

This is the latest error I got and all seem to be roughly the same thing. I hope you guys can help me find a soloution to this.

Regards
Xeronix