NoneType error in commandhandler.py for RC MAP AUX

Following error occurs when accessing param RC MAP AUX before Simulation is fully up with all plugins.

File "/home/patrick/mbzirc_ws/src/mbzirc_ch1/mbzirc_obstacle_task/nodes/statemachine", line 267, in main sm.userdata.mav = MAV("") File "/home/patrick/mbzirc_ws/src/mbzirc_general/mascor_px4_control/src/mascor_px4_control/mav.py", line 71, in init self.command = CommandHandler(self.__namespace, self.localization, self.state, self.logger) File "/home/patrick/mbzirc_ws/src/mbzirc_general/mascor_px4_control/src/mascor_px4_control/commandhandler.py", line 58, in init rc_channel = self.get_param("RC_MAP_AUX"+str(i)).integer AttributeError: 'NoneType' object has no attribute 'integer'