diff --git a/src/datastore_mad/remotes/fs/monitor b/src/datastore_mad/remotes/fs/monitor
index 7017b312a8..8b7f55306f 100755
--- a/src/datastore_mad/remotes/fs/monitor
+++ b/src/datastore_mad/remotes/fs/monitor
@@ -58,6 +58,12 @@ USED_MB=`du -sLm $BASE_PATH 2>/dev/null | cut -f1`
 TOTAL_MB=`df -B1M -P $BASE_PATH 2>/dev/null | tail -n 1 | awk '{print $2}'`
 FREE_MB=`df -B1M -P $BASE_PATH 2>/dev/null | tail -n 1 | awk '{print $4}'`
 
+if [ -z "$USED_MB" -o -z "$TOTAL_MB" -o -z "$FREE_MB"]; then
+    msg="Empty monitoring data"
+    error_message "$msg: USED_MB=$USED_MB, TOTAL_MB=$TOTAL_MB, FREE_MB=$FREE_MB"
+    exit 1
+fi
+
 MONITOR_DATA=$(cat <<EOF
 USED_MB=$USED_MB
 TOTAL_MB=$TOTAL_MB