Server crash & chunks not loading.

So I recently luanched a new Nukkit server on a high performance machine. And everything seemed fine until I started building. I only have one plugin active and itd FAWE (an advanced world edit). When I join the server it seemed fine, but after I leave and try to rejoin, it crashes my Minevraft game. That forces me to "kill" the server and stsrt it back up everytime I re-join. I'm sure that's not good for the server. I don't know what's the problem but can anyone help me fix this?
 
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