Playing video in Preview throws error in console

Steps to Reproduce:
1. Create new project or open attached project
2. Select mp4_Sample file in Project Window
3. Play video in preview

Error in Console:
Function class SoundChannelInstance *__cdecl SoundChannel::operator ->(void) const may only be called from main thread!

Function FMOD_RESULT __cdecl SoundChannelInstance::setChannelGroup(class FMOD::ChannelGroup *) may only be called from main thread!

Actual Result:
Throwing error in console

Expected Result
Should not throw any error

Reproducible on:
2018.3.0a9,2018.3.0a8, 2018.3.0a7

Working fine on:
2018.3.0a6, 2018.3.0a5, 2018.3.a1.

Environment:
Windows 10

Note: Occurring only on Windows 10