[Libgdx]AssetManager in html app

I like to use the libgdx’s asset manager to easily be able to load and dispose a lot of resources but it seems that it works as an asynchronous task cause I have a “Could not submit AsyncTask: Couldn’t load image” so is there a way around it?

1.) Modify the source and check if you can synchronize it (which takes grabbing the context and giving it to another thread (eww))
2.) Check API for a synchronized version (They already did 1 for you)
3.) Only load stuff on your Context thread (Thread you initialize libgdx)