Question [Profile Lookup Executor #0/ERROR]: Uncaught exception in thread Profile Lookup Executor #0 java.lang.IllegalArgumentException: Name and ID

[rugzy]

These show up on every start up. With enough google searching I've found there may be invalid skull block entities in my world. Along with that, my server seems to be lag spiking, kicking everyone out. I'm not sure if these are connected, but with enough people on and enough time- the lag spikes happen.

So my question is, how do I FIND these skulls and remove them from the world?

Thank you.