bug ball stuck

I had it yesterday the fourth time. Strange that noone else has it. I own MM on 2 devices since November: Devices: Steam-PC, Galaxy Tab 3 (Android) Description: Multiball (3x castle multiball, 1x madness) does not end when all but one ball have drained. Table is looking in vain for lost ball...

When flipped from top flipper ball can jump up and get stuck on the wire ramp. Mac OS version.