From 1ceead418e05bbe6a1b0832ddd29d7010cd8bfcf Mon Sep 17 00:00:00 2001
From: Pulse Monitor <pulse@pulse-monitor.dev>
Date: Fri, 22 Aug 2025 08:50:07 +0000
Subject: [PATCH] fix: handle unset UPDATE_CHANNEL variable in download_pulse
 function

Use parameter expansion to prevent 'unbound variable' error when UPDATE_CHANNEL is not set
---
 install.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/install.sh b/install.sh
index 2ac61bd3d..35ee40941 100755
--- a/install.sh
+++ b/install.sh
@@ -641,7 +641,7 @@ download_pulse() {
         fi
     else
         # UPDATE_CHANNEL should already be set by main(), but set default if not
-        if [[ -z "${UPDATE_CHANNEL}" ]]; then
+        if [[ -z "${UPDATE_CHANNEL:-}" ]]; then
             UPDATE_CHANNEL="stable"
             
             # Allow override via command line