unity freeze when use normal map at secondary maps

i use unity 5.3.2f1 osx version

in the case platform = android, unity was freeze ( rainbow mouse cursor ) when attach normal map at secondary maps.

in the case platform = pc attaching normal map at seocondary maps, success.

normal map in the secondary maps is Will not available for android?

inspector screenshot

normal map

detail albedo x 2 same saize of normal map https://teratail.com/uploads/contributed_images/e875943d4948038b7f26f0587cdcc677.png