heey guys

i have a little problem with my 1.8 server

it crashes, sometimes it takes 2 a 3 hours and sometimes just 15 min before it crashes again.

in the server log it shows this:
Code:
at oj.h_(SourceFile:111)
	at eh.e(SourceFile:1193)
	at net.minecraft.server.MinecraftServer.h(SourceFile:370)
	at net.minecraft.server.MinecraftServer.run(SourceFile:303)
	at ce.run(SourceFile:418)
is it just me or do other people have the same problem?