The server crashes when one particular player logs in. It might be related to the area of the map they're in? I'm attaching a plaintext file of the server dump. Dynmap is mentioned, but we've got the most recent version of Dynmap installed and it's not reporting any bugs in the console. Other players are able to log in and play normally. We're unable to replicate the bug with any other player.
Client-side log: https://pastebin.com/LjCTd1rB