Popper playlist that no longer exists
What it means
Some rows in your Popper database point to a playlist that no longer exists.
Why it happens
Deleting a playlist in Popper's admin screen only removes the playlist itself — it leaves behind the games that were assigned to it, now pointing at nothing.
How Pincab Toolbox detects it
One or more games in the Popper database reference a playlist ID that no longer exists in the playlist table.
Check your own pincab
Pincab Toolbox is a free Windows scanner for Visual Pinball X and PinUP Popper. It finds and explains problems like this one. No account, no telemetry.
Download for freeCovered: Visual Pinball X (10.x) and PinUP Popper. Not covered: Future Pinball, Pinball FX, Visual Pinball 9 and the other frontends (PinballX, PinballY).