There isn't currently a perfect fix for the FS_CheckAsyncRequest crash message in Apex Legends, but some players are finding success with fresh installs, validating files or switching to DX11.

On Steam you can do this by right-clicking on Apex Legends, go to “Properties”, “Local Files”, and then click on “Verify integrity of the game files”.

The 'fs_checkasyncrequest' Engine Error is getting more prevalent in Apex Legends.