I’m using BabylonJS 8.41.1 with AudioEngineV2 and a custom audio wrapper (global AudioManager + many SoundPlayer instances). I’m not calling setValueCurveAtTime directly anywhere in my code. From time to time I see this error in the browser console, which is already being suppressed by Babylon’s A…

@docEdub will be back shortly to help with this issue :slight_smile:

Hi @sebavan , let me explain using a specific case how I sometimes catch this error. In the game, the character moves through space; a FreeCamera is attached to it, and a Spatial Sound listener is attached to that camera. As long as the coordinate precision stays at a reasonably whole-number level, e…

BTW: It related bug, but isn’t audio problem at all. Time to time when I read Position from character mesh, I got Y position is NaN and can’t set this position to the Camera. [image] This error also supressed by my custom safe setter: private updatePOVCamera(camera: any) { if (!this.player…

Cool, ya, that will kill the error message, but it will not set the parameter’s value. The PR I made for this ( https://github.com/BabylonJS/Babylon.js/pull/17579 ) does something similar but falls back to setting the parameter’s value directly instead. Try out the latest version of Babylon.js and you…

Thank you so much. I’m really looking forward to the fix being included in the next BabylonJS release. I tried 8.44.1, and it doesn’t seem to have this fix yet. Firefox shows: Uncaught DOMException: AudioParam.value setter: Can't add events during a curve event setTargetValue webAudioParameterC…

Assigning back to @docEdub as it sounds 8.44.1 should be working

Anyway we have huge progress. In the Chrome this error disappears completely. Now we see another error (in same place spatialAudio, but another). Firefox, oh, Firefox. :grin:

Oh interesting. This is a slightly different error occurring when setting the value directly. I had not expected this would also fail when curves are active, but it does on Firefox (of course). I will try again to repro this on Firefox since it’s doing strange things. If I can get it to repro then …

I can get it to repro on Firefox about 40% of the time with this playground: https://playground.babylonjs.com/#P1FP6L Interestingly, as I increase ItemCount, it repros less often. Also interesting this only happens close to the start of audio. After a few seconds the error stops happening.

There is some issue with Firefox’s implementation of cancelScheduledValues causing this. It works 99.999% of the time, but fails in some rare cases when there are a lot of calls to cancelScheduledValues and setValueCurveAtTime with overlapping time ranges. Since this happens so rarely I’m going to r…

Web Audio API error related

Bugs

docEdub January 9, 2026, 9:55pm 32

PR 17641 should fix/workaround this.

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Web Audio API error related

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