diff --git a/master/master/lib/slavesensors.c b/master/master/lib/slavesensors.c
--- a/master/master/lib/slavesensors.c
+++ b/master/master/lib/slavesensors.c
@@ -79,7 +79,9 @@ char* slavesensors_getLabel(uint8_t sens
 	}
 	else 
 	{
-		return NULL;
+		// Print out the sensor ID if there is no label in the lookup table
+		snprintf(labelBuffer, 15,"%u",sensorID);
+		return labelBuffer;
 	}
 }