Shaders issues with Android 7.0?

I’m using a fragment shader in my game and it works perfectly on my test devices Samsung Tab S (android 5.0.2), and Samsung Tab 3 Lite (android 4.4).

However on a Nexus 6P (android 7.0), the game crashes the moment the shader comes into use.

Does anyone know if there is there anything new in android 7.0 in regards to graphics that might cause a shader to crash?