HfNiSn is a semiconducting material with cubic crystal symmetry, and as such it should not show any anisotropy in electronic transport.However, at low temperatures we observe deviations from this normal semiconducting behavior: the longitudinal resistance (where a voltage drop is measured along the path of an applied current) is clearly different from the transverse resistance (where the voltage is measured perpendicular to the current path). Such a behavior is normally observed in an applied magnetic field, but in HfNiSn we see this anisotropy already at zero magnetic field. This result is surprising, as both theoretical calculations and measurements the magnetic properties of HfNiSn indicate it is a nonmagnetic material. It is in fact strongly diamagnetic. We suspect that HfNiSn may possess an internal magnetic field, which we want to verify using the spins of muons as a probe.