Assertion failed: NetDriver

I seem to be having trouble figuring out why this error keeps happening whenever I try to join a hosted game over the internet through steam. Assertion failed: NetDriver [File:C:\Users\Gary\Desktop\UnrealEngine-release\Engine\Source\Runtime\Engine\Private\PendingNetGame.cpp] [Line: 43]

I don’t see any other problems within the crash log that would point me in a direction to fix it. Any help with fixing this would be appreciated.

My game is also running the source built engine (4.18 version)

CrashLog:

Hello,

We’ve recently made a switch to a new bug reporting method using a more structured form. Please visit the link below for more details and report the issue using the new Bug Submission Form. Feel free to continue to use this thread for community discussion around the issue.

https://forums.unrealengine.com/unreal-engine/announcements-and-releases/1410408-unreal-engine-bug-submission-form

Thanks