Had a series of server crashes after requesting schematicannon material list - ultimately had to delete the region file in order to relaunch the server.
crash-2020-09-02_21.39.35-server.txt
crash-2020-09-02_21.36.52-server.txt
crash-2020-09-02_21.24.04-server.txt
crash-2020-09-02_21.18.28-server.txt

did you have a mod that added fancy tree mechanics like trees falling? because thats what im seeing

I fixed this crash with a pull request to Falling Trees (RakambdaOrg/FallingTree#24)
They did a cast that was crashing. Falling Trees 2.3.1 (went online just 30min ago) includes the fix. Thanks to @RakSrinaNa for the fast merge of my PR.
That new Falling Trees version should fix this crash (it did in my testing). If it does not fix that crash, reopen this issue with a new crash report on the new Falling Trees version.