Need help solving server crash [Exception in server tick loop]

Can someone help me with this? Server generally runs smoothly until one of these random crashes.
Any help is much appreciated, thanks in advance!

Forge 1.8.9 (11.15.1.1890) Sponge 4.2.0-BETA-1402

Crash Log:

Console:

This issue is caused by Pixelmon spawning entities off of the main thread. I would report this error to them.

Ah ok, thank you!
I also came across another error causing server to crash, is this tied to the first error or something different?

Crash Log:

Thanks again!