Error 0xC0000005 Matlab engine for python

I'm using Matlab engine for python. I test it with the code:

import matlab.engine
eng = matlab.engine.start_matlab()
eng.isprime(3)

Everything goes fine until this point. When trying with this:

eng.regionprops(matlab.uint8(thrVariance.tolist()), 'Eccentricity')

I got:

ValueError: only struct scalar can be returned from MATLAB

So I created region_props.m with the following code:

function rv = region_props(img, opc)
rv = struct('r',regionprops(img, opc));

to convert the result of regionprops function to scalar struct.

When I test this in Matlab work fine but in python the code:

eng.region_props(matlab.uint8(thrVariance.tolist()), 'Eccentricity')

throw:

Process finished with exit code -1073741819 (0xC0000005)