diff --git a/powerwall.sh b/powerwall.sh
index f36097f2..02cedc15 100755
--- a/powerwall.sh
+++ b/powerwall.sh
@@ -743,7 +743,7 @@ fi
 			while IFS=$'\t' read id date hum ;do
 				QRY="UPDATE sensor_data SET hum='${hum}' WHERE sensorid=17 AND date='${date}'"
 				${mysql_conn} -e "USE servermonitor; ${QRY}"
-				QRY="UPDATE sensor_data SET hum=NULL WHERE id=${id}'"
+				QRY="UPDATE sensor_data SET hum=NULL WHERE id='${id}'"
 				${mysql_conn} -e "USE servermonitor; ${QRY}"
 			done  < <(${mysql_conn} -se "SELECT id,date,hum from servermonitor.sensor_data WHERE sensorid=18 AND hum!='';")