diff --git a/nodemgmt-scripts.sh b/nodemgmt-scripts.sh
index 35fce30b..d00b4222 100755
--- a/nodemgmt-scripts.sh
+++ b/nodemgmt-scripts.sh
@@ -507,6 +507,12 @@ UPDATE_DYNDNS(){
 			echo -en "${idsCL[LightCyan]}Old IP ${idsCL[White]}: "
 		fi
 		
+		if [ "${NM_DYNUSER}" == "" ] || [ "${NM_DYNPASS}" == "" ]; then
+			echo "Missing DYNDNS username or password (NM_DYNUSER=${NM_DYNUSER}) (NM_DYNPASS=${NM_DYNPASS})"
+			SENDNOTICE "${1^^} DYNDNS ERROR" "Missing DYNDNS username or password (NM_DYNUSER=${NM_DYNUSER}) (NM_DYNPASS=${NM_DYNPASS})"
+			exit 1
+		fi
+		
 		if [ "${1}" == "home" ]; then
 			OLDIP=`dig +short sc1.scity.us @ns1.scity.us +time=2`
 		elif [ "${1}" == "offsite" ]; then