diff --git a/src/packages/fff/fff-gateway/files/etc/gateway.d/01-version b/src/packages/fff/fff-gateway/files/etc/gateway.d/01-version
index 9d30322..89129cb 100644
--- a/src/packages/fff/fff-gateway/files/etc/gateway.d/01-version
+++ b/src/packages/fff/fff-gateway/files/etc/gateway.d/01-version
@@ -10,6 +10,12 @@ configure() {
 	fi
 
 	# check version of configuration
+	if ! [ -n "$config_version" ]; then
+		echo "ERROR: No config version given. Supported versions: '$expected_version'"
+
+		exit 1
+	fi
+
 	if [ "$config_version" != "$expected_version" ]; then
 		echo "ERROR: Invalid config version. Expected '$expected_version', got '$config_version'."
 		echo "Please check what has been changed and adjust your config appropriately."