Factorio Forums

I was using construction robots to add an additional lane to the main bus, and one of the robots got stuck and wouldn't reenter the roboport. The alert tab appeared saying "Not enough empty roboport robot slots available" even though there was a completely empty roboport right next to the robot. Hovering over the roboport showed 2180/2180 available construction robots even though that robot was not in the roboport. Breaking and replacing the roboport did not fix the alert, and I eventually picked up the robot to clear the alert.

Speculation on what may have caused the issue: I had 51 construction robots in my inventory but only 2 personal roboport mk2, somehow the game may have deployed 51 robots instead of 50, and that last robot got stranded outside my inventory. I don't know what would've caused this to happen, or why the robot didn't join the main robot network.

Thanks for reporting this issue. Do you have a save file which still has the alert?

Might have been fixed by 122158.

This alert wasn't touched by the fix.