# Sequencer playback Issue
**URL:** https://qa.fmod.com/t/sequencer-playback-issue/14288
**Category:** Unreal Engine
**Created:** [January 9, 2019, 12:27pm UTC](https://qa.fmod.com/t/sequencer-playback-issue/14288 "2019-01-09T12:27:56Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@BalthazarVR](https://qa.fmod.com/u/BalthazarVR)
#### Post date: [January 9, 2019, 12:27pm UTC](https://qa.fmod.com/t/sequencer-playback-issue/14288/1 "2019-01-09T12:27:56Z")
Hello,
We’ve been using Fmod/Unreal and Its sequencer for a while but stumbled on a issue yesterday with the latest Studio version (1.10.10) running with the 4.20.3 version of UE:
On startup the banks load and every event track plays and stops properly in the sequencer but when rebuilding the banks (with UE editor running in the background) and when I playback again in the sequencer I have no sound at all with the same events in the sequencer and I get this message In the Output Log:
> ```
> LogFMOD: Error: 'StudioInstance->setUserData(this)' returned 'An invalid object handle was used.'
> LogFMOD: Error: 'StudioInstance->setCallback(UFMODAudioComponent_EventCallback)' returned 'An invalid object handle was used.'
> LogFMOD: Error: 'StudioInstance->start()' returned 'An invalid object handle was used.'
>
> ```
The banks are still there and I can correctly preview them in the content browser though…
When I restart the editor everything is fine, but I can’t afford to restart the editor each time the banks are rebuilt 😕
Is there any compatibility issue known with this version ? Maybe there is a way to troubleshoot this. Or if someone could point us towards a prior version of studio without these sequencer compatibility issues with the 4.20.3 that would be great!
Thanks for any help!
---
### Author:  [@BalthazarVR](https://qa.fmod.com/u/BalthazarVR)
#### Post date: [January 9, 2019, 5:32pm UTC](https://qa.fmod.com/t/sequencer-playback-issue/14288/2 "2019-01-09T17:32:53Z")
I tried today with blanks projects on UE 4.20 and 4.19 and 4.16 with all compatible versions of Fmod and still got this same issue. Until I reverted with the one we used with our previous project: the 1.09.06 version and it worked like a charm… We already moved on with 4.20 and 1.09.06 is not compatible so we’re stuck.
Any help ?
---
### Author:  [@jlecorre](https://qa.fmod.com/u/jlecorre)
#### Post date: [January 11, 2019, 4:02pm UTC](https://qa.fmod.com/t/sequencer-playback-issue/14288/3 "2019-01-11T16:02:29Z")
If anyone else encounters the same issue, we got an answer from @cameron-fmod by e-mail:
> After some testing, it looks like this is caused by the StudioInstance pointer in the FMODAudioComponent becoming invalidated but not cleaned up.
>
> If you could test this for me, to make sure I’m not missing anything with my test, I would be extremely grateful.
>
> In UFMODAudioComponent::PlayInternal, line 648 there should be:
> if (StudioInstance == nullptr)
>
> Change this to:
> if (!(StudioInstance && StudioInstance-\>isValid()))
>
> This will make check to see if the pointer contains a valid instance before attempting to play.
This did solve the problem for us.
Thanks, Cameron!
---
### Author:  [@cameron-fmod](https://qa.fmod.com/u/cameron-fmod)
#### Post date: [January 13, 2019, 9:36pm UTC](https://qa.fmod.com/t/sequencer-playback-issue/14288/4 "2019-01-13T21:36:19Z")
I’ll make sure this is added for the next release.