diff --git a/inc/power.inc.sh b/inc/power.inc.sh
index 8e35d193..dbd2d3c8 100644
--- a/inc/power.inc.sh
+++ b/inc/power.inc.sh
@@ -6,9 +6,11 @@ AVERAGEPOWER(){
 		total_amp=0
 		total_watt=0
 		while IFS=$'\t' read date amp watt ;do
-			total_amp=$(bc <<< "scale=2; ${total_amp}+${amp}")
-			total_watt=$(bc <<< "scale=2; ${total_watt}+${watt}")
-			((logsfound++))
+			if [ "${amp}" != "" ] && [ "${watt}" != "" ]; then
+				total_amp=$(bc <<< "scale=2; ${total_amp}+${amp}")
+				total_watt=$(bc <<< "scale=2; ${total_watt}+${watt}")
+				((logsfound++))
+			fi
 		done  < <(${mysql_conn} -se "USE servermonitor; SELECT date,amp,watt from power_data WHERE sensorid=${sensorid} AND date BETWEEN DATE_SUB(DATE(NOW()), INTERVAL ${daysback} DAY) AND NOW() ORDER BY id DESC;")
 		if [ "${logsfound}" != "0" ]; then
 			average_amp=$(bc <<< "scale=2; ${total_amp}/${logsfound}")
@@ -22,8 +24,10 @@ AVERAGEPOWER(){
 		total=0
 		[ "${3}" != "" ] && ptype=${3} || ptype=watt
 		while IFS=$'\t' read date ${ptype} ;do
-			total=$(bc <<< "scale=2; ${total}+${!ptype}")
-			((logsfound++))
+			if [ "${!ptype}" != "" ]; then
+				total=$(bc <<< "scale=2; ${total}+${!ptype}")
+				((logsfound++))
+			fi
 		done  < <(${mysql_conn} -se "USE servermonitor; SELECT date,${ptype} from power_data WHERE sensorid=${sensorid} AND date BETWEEN DATE_SUB(DATE(NOW()), INTERVAL ${daysback} DAY) AND NOW() ORDER BY id DESC;")
 		[ "${logsfound}" != "0" ] && average=$(bc <<< "scale=2; ${total}/${logsfound}") || average=0
 		echo ${average}