Flask-Fixtures - Popped wrong app context Error

I'm kind of frustated here

I'm trying to use Flask-Fixtures library for testing and getting this error:

AssertionError: Popped wrong app context. (<flask.ctx.AppContext object at 0x7f385a108c50> instead of <flask.ctx.AppContext object at 0x7f385a1641d0>)

I recreate a simple project following the library instruction on it's github and still got the same error

Do I miss something?