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Issue Description: I've noticed my dynmap doesn't update at all, I already have a fullrender of the entire map. I'm using MySQL for storage, and when executing /dynmap updaterender it gives me an error in the console.

• Dynmap Version: 3.7-SNAPSHOT-948
• Server Version: Purpur 1.21.1-2296-568a028
• Pastebin of Configuration.txt: https://pastebin.com/Yc2mR29W
• Server Host (if applicable): Selfhosted, Pterodactyl
• Pastebin of crashlogs or other relevant logs: https://pastebin.com/p2K0gXvg
• Other Relevant Data/Screenshots: I'm using these plugins: AntiPopup, AxiomPaper, BlueSlimeCore, Citizens, CombatLogX, CoreProtect, dynmap, Essentials, EssentialsSpawn, FastAsyncWorldEdit, floodgate, GSit, KingdomCraft, KingdomCraftPremium, LibsDisguises, LiteBans, LuckPerms, MagicalWands, OpenInv, packetevents, PlaceholderAPI, PremiumVanish, ProtocolLib, sleep-most, TAB, Vault, WorldGuard
• Steps to Replicate: Fullrender your map, execute /dynmap updaterender

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