I picked it up to empty it then pressed undo to place it again, but my roboport was off. I saw the "Recall Robots" popup there still, as if I still had the original open, but there was just a ghost. Then a crash:

The mod Robot Recall (0.2.15) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event robot-recall::on_nth_tick(180)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
    [C]: in function '__index'
    __robot-recall__/control/robot-recall.lua:565: in function <__robot-recall__/control/robot-recall.lua:559>