RemoveBuildingForPlayer and server crash problem

Hi. This is my big problem.
I removed 60 GTA:SA objects, only in certain regions server crashes.
for example, four dragon casino building object removed, later server connect and go to /fourdragon command or go to only in that region(casino area) server crashed. The same problem chilliad, cranberry station, old airport etc. available : /
Is there a way to fix this problem ? Sorry i'm bad English.