Unreal Engine Crashes When Adding Ambient Sound Actor

When I tried adding ambient sound to the project, as soon as I place the Ambient Sound actor in the scene, Unreal Engine crashes with the error:

Assertion failed: IsValid() [File:D:\Build\++UE4\Sync\Engine\Source\Runtime\Engine\Public\AudioDeviceManager.h] [Line: 150]

This happened after many attempts at placing the ambient sound.

What version of UE4 are you using?

Thanks for the quick reply. This was in version 4.26. I realised I was having some other sound problems, potentially one of the sound cues was set to nothing at some point. Once these were fixed I was able to then add the ambient sound without any issue.

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