Of course, on the line connecting the masses there is exactly one point in which the forces from the masses cancel each other (i.e. are equal in size and opposite in direction). At exactly this point you are asked to compute the gravitational potential. (Since the question is written in bad English it is not completely obvious what is asked for.)

@Krishnananda: Yes.

Where I answered 'Yes', I should have answered 'Yes,if the bodies are assumed to be point masses' (otherwise 'the line connecting the bodies' may make no sense; but also for spherical bodies, where there is such a line, the force cancellation may not happen since the Newton force and potential formula then is valid only outside the body).