On a randomly spawned survival map friends and I changed to creative to create an adventure map however after searching around the place, the server started to crash randomly producing the exact same report each time.
Only now when I was looking at the badly generated map I found the problem and the server crashed. I told my friend to go over to it and the exact same thing happened
When this...thing... (shown in the attachments) loads, the server crashes completely
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Took the world save to single player and destroyed the Carrot button tree without any crashes then replaced the multiplayer save with the single player save and all appears to be working now
Carrot tree? Is the server modded? if so then I think this is invalid.
This was a randomly generated world straight from a server load
There are no server mods
So where did the carrot tree come from?
I wish I could tell you.

What is the world seed + coordinates of this?
World.
Edit.
Duplicate of MC-1510.