This was showing up in the firefox audioworklet implementation, but @padenot pointed me to an [issue on the chrome bug tracker ](https://bugs.chromium.org/p/chromium/issues/detail?id=1060579) showing it may change there Not sure if this is the best way to fix it, but it's working for me https://github.com/iPlug2/api/commit/d936c46c230ddf82f39311c1191787fd516a3419