[Simon]

INVALID_PLAYER_ID is a number, you must set your variable to INVALID_PLAYER_ID for it to work.

pawn Code:

if ( !IsPlayerConnected( targetid ) )
{
  targetid = INVALID_PLAYER_ID ;
}

Best thing to do would be to change

pawn Code:

if (targetid != INVALID_PLAYER_ID)

to

pawn Code:

if ( !IsPlayerConnected( targetid ) )