diff --git a/powerwall.sh b/powerwall.sh
index 6e49caf4..20217591 100755
--- a/powerwall.sh
+++ b/powerwall.sh
@@ -264,7 +264,7 @@ CHECKTEMP_SERVICE(){
 						if [ "${PW_TEMP_THRESHOLDS[${SENSORa}]}" != "" ]; then
 							echo ${PW_TEMP_THRESHOLDS[${SENSORa}]} | cut -d',' -f 1 | read temp_warn
 							echo ${PW_TEMP_THRESHOLDS[${SENSORa}]} | cut -d',' -f 2 | read temp_crit	
-							[ "${PW_TEMP_THRESHOLDS[${SENSORa}]} | cut -d',' -f 3" != "" ] && echo ${PW_TEMP_THRESHOLDS[${SENSORa}]} | cut -d',' -f 3 | read temp_crit_sys || temp_crit_sys=${temp_crit}
+							[ "$(${PW_TEMP_THRESHOLDS[${SENSORa}]} | cut -d',' -f 3)" != "" ] && echo ${PW_TEMP_THRESHOLDS[${SENSORa}]} | cut -d',' -f 3 | read temp_crit_sys || temp_crit_sys=${temp_crit}
 						fi
 				
 						if [ "${PW_SENSOR_TYPE[${SENSORa}]}" == "mqtt" ]; then