I have a station in orbit around Minmus, and right now there are 4 ships docked at it. Now, when I click the undock button, nothing happens, except the button disapears. The log says: [WRN 22:52:54.850] [DockingNode]: other node is null! [WRN 22:52:54.856] [DockingNode]: other node is null! [WRN 22:52:54.858] [DockingNode]: other node is null! [WRN 22:52:54.861] [DockingNode]: other node is null! [WRN 22:52:54.862] [DockingNode]: other node is null! [WRN 22:52:54.862] [DockingNode]: other node is null! [WRN 22:52:54.985] [PartJoint]: None of the provided nodes was valid! [WRN 22:52:54.988] [PartJoint]: None of the provided nodes was valid! [WRN 22:52:54.992] [PartJoint]: None of the provided nodes was valid! [WRN 22:52:54.998] [PartJoint]: None of the provided nodes was valid! Has anyone any suggestions how to unstuck my ports? I am running KSP 64-bit on Debian8 64-bit, sometimes with steam, sometimes not.