A friend of mine reported:
L 07/17/2013 - 14:28:51: [SM] Plugin encountered error 15: Array index is out of bounds
L 07/17/2013 - 14:28:51: [SM] Displaying call stack trace for plugin "spawnandkillprotection.smx":
L 07/17/2013 - 14:28:51: [SM] [0] Line 407, spawnandkillprotection.sp::Hook_OnTakeDamage()
I haven't seen this but have sent him a debug version with an entity check of attacker being >0 || < MAXPLAYERS and can review his logs later.