are u sure the problem is there? 

           local position = getThingPosition(uid)
	   local fromPosition = getThingPosition(target)
	   local x = ((fromPosition.x - position.x) < 0 and -1 or ((fromPosition.x - position.x) == 0 and 0 or 1))
	   local y = ((fromPosition.y - position.y) < 0 and -1 or ((fromPosition.y - position.y) == 0 and 0 or 1))
	   local toPosition = {x = fromPosition.x + x, y = fromPosition.y + y, z = fromPosition.z}

this is pretty correct unless your server doesn't have getThingPosition.

Instead of getThingPosition I have getThingPos.

switch those in the script and see if it's work, if it don't, show me the errors.

local function doPushCreature(target, cid)
	if target > 0 then
		local position = getThingPos(cid)
		local fromPosition = getThingPos(target)
		local x = ((fromPosition.x - position.x) < 0 and -1 or ((fromPosition.x - position.x) == 0 and 0 or 1))
		local y = ((fromPosition.y - position.y) < 0 and -1 or ((fromPosition.y - position.y) == 0 and 0 or 1))
		local toPosition = {x = fromPosition.x + x, y = fromPosition.y + y, z = fromPosition.z}
		if queryTileAddThing(target, toPosition) == 1 and getTileInfo(toPosition).house == false then
			doTeleportThing(target, toPosition)
		end
    end
end

server crash :/

*queryTileAddThing from newer server version

do you think it's the queryTile that's causing the server to crash?I have a function that may replace it..