Enable Surface Reflectors On AkSpatialAudioVolume Crashes Unreal

Question

Hello,

I have set up AkSpatialAudioVolumes in my UE4.21 project and am attempting to set up spot reflectors but when i check the enable surface reflectors option and play in the editor the engine crashes and closes immediately, when it is unchecked it doesn't happen, has anyone seen this before?

My Wwise and Integration version are both 2019.1.4

Thanks,

Will