diff --git a/ohmpi/ohmpi.py b/ohmpi/ohmpi.py
index 22d55be4dfaf5369d3ab3f8ed22e4b0feb7c2afa..cc260ae63f23341ae43831edcb5152ff5c6a4b45 100644
--- a/ohmpi/ohmpi.py
+++ b/ohmpi/ohmpi.py
@@ -810,7 +810,7 @@ class OhmPi(object):
             self.exec_logger.debug(f'tx pwr voltage: {self._hw.tx.pwr.voltage}, rx max voltage: {self._hw.rx._voltage_max}')
             return False
         else:
-            if np.array(quadrupole) == np.array([0, 0, 0, 0]):  # NOTE: No mux
+            if np.array(quadrupole).all() == np.array([0, 0, 0, 0]).all():  # NOTE: No mux
                 return True
             else:
                 return self._hw.switch_mux(electrodes=quadrupole, state='on', bypass_check=bypass_check)