From 1062a967b09c976b178f9f6097d8abb178a6d7ff Mon Sep 17 00:00:00 2001
From: Tobit Flatscher <53856473+2b-t@users.noreply.github.com>
Date: Wed, 11 Oct 2023 23:29:06 +0100
Subject: [PATCH] fix: Prevent dialog from failing when PREEMPT_RT is not
 available for given Debian version

---
 src/lib_install_debian.sh | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/lib_install_debian.sh b/src/lib_install_debian.sh
index 99746ff..4c21611 100755
--- a/src/lib_install_debian.sh
+++ b/src/lib_install_debian.sh
@@ -27,7 +27,9 @@ function select_debian_version() {
   local DIALOG_POSSIBLE_DEBIAN_VERSIONS=""
   for VER in ${POSSIBLE_DEBIAN_VERSIONS}; do
     local PREEMPTRT_FILE=$(get_preemptrt_file "$VER")
-    DIALOG_POSSIBLE_DEBIAN_VERSIONS="${DIALOG_POSSIBLE_DEBIAN_VERSIONS} ${VER} ${PREEMPTRT_FILE}"
+    if [ ! -z "${PREEMPTRT_FILE}" ]; then
+      DIALOG_POSSIBLE_DEBIAN_VERSIONS="${DIALOG_POSSIBLE_DEBIAN_VERSIONS} ${VER} ${PREEMPTRT_FILE}"
+    fi
   done
   echo $(dialog --keep-tite --stdout --menu "Select the desired PREEMPT_RT kernel version:" 0 0 4 ${DIALOG_POSSIBLE_DEBIAN_VERSIONS})
 }