TypeError: Browser.mainLoop.scheduler is not a function

Hi,
Got this message : “TypeError: Browser.mainLoop.scheduler is not a function” when I’m trying to test my project on Firefox (same error on Safari).
After a look at : Unreal Engine Issues and Bug Tracker (UE-36937) : no effect.
After rebuild a new project with migrating only the assets needed : no effect.
After trying again in Safari : no effect.
The error is always displaying after compiling the project.

Safari : Version 10.1.2 (12603.3.8)
Firefox : 55.0.3 (64 bits)
MacOs : 10.12.6
Unreal Engine : 4.17.1

If someone could help,
Thank’s.

Today, I have try to compile an blank html project and it works fine. My setup and OS or applications used are not involved in the crash.
Testing with importing my game into this blank project after removing all maps and meshs inside.
After compiling message : “Expression (!IsInRenderingThread()) failed in D:\Build++UE4+Release-4.17+Compile\Sync\Engine\Source\Runtime\Landscape\Private\LandscapeRenderMobile.cpp:313!” in Firefox, and then return of error : TypeError: Browser.mainLoop.scheduler is not a function.
So, still stuck…
Thank you and sorry for my bad English…

Did you ever solve this problem?