If it's on macOS, this can happen after putting the machine to sleep and waking it up. It's a warning that the current Portaudio stream was closed which can also happen when a connected device is unplugged. Previous to 0.49, Pd simply hard froze when this happened...
Date: Tue, 26 Feb 2019 17:10:34 +0100From: Maximiliano Estudies <maxiestudies@gmail.com>To: pd-list@lists.iem.atSubject: [PD] error -9988: Invalid stream pointerMessage-ID: <CAF358wThoNNuZuz-sMwzSQWf6fmvyf0wgZ2tUSRwMpJBQi0vOg@mail.gmail.com>Content-Type: text/plain; charset="utf-8"Hello List,A couple of days ago I started getting this error message:error -9988: Invalid stream pointeraudio device not responding - closing audioyou may need to save and restart pdI'm not sure how to reproduce it. I tried several different patches andthey all seem to randomly cause it. Sometimes pd freezes, sometimes I canturn dsp off and then on again and everything works. Google didn't help.