From a7724ac96870dbca274ad63d695df5bbaa4cf376 Mon Sep 17 00:00:00 2001
From: unknown <admin@radsl.net>
Date: Thu, 4 Dec 2025 14:40:09 -0800
Subject: [PATCH] ...

---
 ebook2audiobook.sh | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ebook2audiobook.sh b/ebook2audiobook.sh
index f5d7b6d7..424a763a 100755
--- a/ebook2audiobook.sh
+++ b/ebook2audiobook.sh
@@ -681,6 +681,10 @@ function check_sitecustomized {
 
 function build_docker_image {
 	local ARG="$1"
+	if [[ "$ARG" == "" ]]; then
+		echo "build_docker_image() error: ARG is empt"
+		return 1
+	fi 
 	local TAG=$(python3 -c 'import json,sys; print(json.loads(sys.argv[1])["tag"])' "$ARG")
 	if ! command -v docker >/dev/null 2>&1; then
 		echo -e "\e[31m===============>>> Error: Docker must be installed and running!.\e[0m"