TypeError in division over Integer variable

I'm trying to divide my objective over an Integer variable, but I get the following error :
:
TypeError: unsupported operand type(s) for /: 'int' and 'QuadraticModel'

Below is how I defined my variable :
k_i = {i: Integer('k_{}'.format(i), lower_bound=0, upper_bound=38) for i in range(M)}

How can I resolve this or reform my implementation for the same effect?