Spring RTS Engine

What is this and how do I fix it?

In error dialog box
"Error"
"logic error (/data/private/buildbot/slaves/springlobby/release/build/src/gui/mainc/hattab.cpp:95 ): m_server_chat = 0"

known issue:

https://github.com/springlobby/springlobby/issues/578

happens when the server tab is closed and for some unknown condition i guess.