I'm trying to play with family members and it keeps telling them "network error: getsockopt". No matter what i did to fix this, it still wouldn't let us play together. Please fix this

I'm trying to play with family members and it keeps telling them "network error: getsockopt". No matter what i did to fix this, it still wouldn't let us play together. Please fix this

What I expected to happen was...:
Being able to play on LAN

What actually happened was...:
error named getsockopt wouldn't stop appearing

Steps to Reproduce:
1. Open singleplayer world to LAN
2. Wait for other player to try and connect
3. error appears on above other players (^) screen