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Issue Description: Dynmap sample issue description. This description would include as much and as little detail necessary for us to understand the issue in its entirety.

placing backpacks on the ground from Sophisticated Backpacks
or Open iron door with button

• Dynmap Version: Dynmap 3.3.2-696
  This is the crashlog has way more information then you need but its better to have too much then not enough

Place backpack
https://crashy.net/mWbttqmCj0vKx9CXYAcn

open iron door
https://crashy.net/Q0Mrizpuzqmi228Sd2iW

[x ] I have looked at all other issues and this is not a duplicate
[x ] I have been able to replicate this

I can confirm that the bandaid stopped the crash with iron doors and backpacks placed in the world while im testing things client side. Thank you for such a fast patch and quick reply.
I do understand that this is a server side ONLY plugin, and you really wouldn't want to run it on clients.
again thank you.

Try latest development build - it should not throw error, but update triggers will likely not work.

We don't technically support running Dynmap in the client (which is what this appears to be associated with), but I'll give working around it a look.