diff --git a/include/option.sh b/include/option.sh
index 3d9f453..4506616 100755
--- a/include/option.sh
+++ b/include/option.sh
@@ -121,6 +121,7 @@ EOF
 
 check_defconfig()
 {
+	[ -d "$1" ] || $err "Target '$1' not defined."
 	for x in "${1}"/config/*; do
 		[ -f "${x}" ] && printf "%s\n" "$x" && return 1
 	done