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Issue Description: I'm currently in the process of transferring my server over to Mohist. I understand that Dynmap may not 100% support this yet, however i thought i'd post this anyway just encase it is an issue with Dynmap. I've tried using multiple different versions of Dynmap. I've tried using multiple versions of Mohist. So far, i've managed to get the forge version of Dynmap working, which is great, however the server i run relies heavily on the use of Towny Dynmap, therefore i cannot use the forge version of Dynmap. If i've missed out some crucial data, please let me know! Thanks very much.

• Dynmap Version: 3.1 GA
• Server Version: mohist-1.16.5-641-server.jar
• Server Host: Self hosted
• Pastebin of crash logs or other relevant logs: short Pastebin of crash here full log here
• Steps to Replicate: Using the dynmap plugin on a Mohist server seems to replicate this error.

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

EDIT: The issue is with Mohist. The Mohist team are now onto fixing the issue.