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A very common crash is caused by a certain popular mod/hack, I won't say which, but it can crash servers by adding invalid modifications/components to a vehicle, making players around them crash. There is protection against this which works 100%, which is highly recommended if you use any types of vehicles in your server. If this isn't fixing the problem, check your server log for any errors.

Server Illegal Mod Crashing Protection (Credits to JernejL): https://sampforum.blast.hk/showthread.php?tid=317303