diff --git a/generate-irr-filter.sh b/generate-irr-filter.sh
index 1f88ea4..0f60c72 100755
--- a/generate-irr-filter.sh
+++ b/generate-irr-filter.sh
@@ -84,7 +84,12 @@ mkdir -p "${BIRD_CONF_PATH}"/functions
 if [ "${PEER_AS}" -gt 65535 ]; then
 	# la t'es bien
 	eval $(whois AS47214 | awk '/AS32 to AS16/ { print "AS"$5"="$7";" }' | sed -E 's/AS([0-9]+)/\1/g')
-	eval COMMU_PEER_AS=\$AS${PEER_AS}
+	if [ -n "${PEER_AS}" ]; then
+		eval COMMU_PEER_AS=\$AS${PEER_AS}
+	else
+		echo "AS16 - AS32 from whois AS${IXP_ASN} not found"
+		exit 1
+	fi
 else
 	COMMU_PEER_AS=${PEER_AS}
 fi