DH 2.1.3 Server Crash - Exception ticking world

Running the server fork of DH for 2.1.3 and after getting it working and sending chunks occasionally it will report that its unable to save a chunk and then eventually it causes a Exception ticking world and crashes the server via the watchdog soon afterwards.

Attached are both logs, full server log since initialization and crash log of the ticking world. Any clue to the mod causing it or if its just an issue with this version of DH would be appreicated.
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