From f9ef70473fc0cf8c1542326a682cd812f5d73715 Mon Sep 17 00:00:00 2001
From: Michel Roegl-Brunner <michel.roegl-brunner@htl-braunau.at>
Date: Fri, 16 May 2025 10:35:21 +0200
Subject: [PATCH] Fix variable expansion syntax in config_file function

---
 misc/build.func | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/misc/build.func b/misc/build.func
index cd6ca745..6a32bf9f 100644
--- a/misc/build.func
+++ b/misc/build.func
@@ -781,7 +781,7 @@ config_file() {
       source "$CONFIG_FILE"
     fi
   fi
-  if [[ -n "${CT_ID}" ]]; then
+  if [[ -n "${CT_ID-}" ]]; then
     if [[ "$CT_ID" =~ ^([0-9]{3,4})-([0-9]{3,4})$ ]]; then
       MIN_ID=${BASH_REMATCH[1]}
       MAX_ID=${BASH_REMATCH[2]}