diff --git a/qbittorrent/CHANGELOG.md b/qbittorrent/CHANGELOG.md
index ef1dc986d2..9d3cb1ce57 100644
--- a/qbittorrent/CHANGELOG.md
+++ b/qbittorrent/CHANGELOG.md
@@ -1,4 +1,7 @@
 
+## 5.2.0-4 (2026-05-10)
+- Fix "unbound variable" crash: use \`${LSIO_NON_ROOT_USER:-}\` so the variable is safely empty when unset; remove duplicate QB_BIN detection block
+
 ## 5.2.0-3 (2026-05-10)
 - Fix qBittorrent restart loop: remove s6-notifyoncheck (notification-fd 3 EBADF when not running under s6-rc), discover binary path dynamically across LSIO image layouts, remove `/dev/stdout` redirect that fails on some ARM runtimes, align with upstream LSIO run script (WebUI address from config, LSIO_NON_ROOT_USER)
 - Fix Dockerfile: add missing `-i` flag to `sed '11,13d'` so default config lines are actually removed at build time
diff --git a/qbittorrent/config.yaml b/qbittorrent/config.yaml
index 78eca23a9f..5903974890 100644
--- a/qbittorrent/config.yaml
+++ b/qbittorrent/config.yaml
@@ -143,4 +143,4 @@ schema:
 slug: qbittorrent
 udev: true
 url: https://github.com/alexbelgium/hassio-addons
-version: "5.2.0-3"
+version: "5.2.0-4"
diff --git a/qbittorrent/rootfs/etc/s6-overlay/s6-rc.d/svc-qbittorrent/run b/qbittorrent/rootfs/etc/s6-overlay/s6-rc.d/svc-qbittorrent/run
index 5d51f2e215..ab84736533 100644
--- a/qbittorrent/rootfs/etc/s6-overlay/s6-rc.d/svc-qbittorrent/run
+++ b/qbittorrent/rootfs/etc/s6-overlay/s6-rc.d/svc-qbittorrent/run
@@ -1,6 +1,8 @@
 #!/usr/bin/with-contenv bashio
 # shellcheck shell=bash
 
+set +u
+
 WEBUI_PORT=${WEBUI_PORT:-8080}
 export PATH="/usr/local/sbin:/usr/local/bin:${PATH}"
 
@@ -56,20 +58,6 @@ if [[ -z "${QB_BIN}" ]]; then
     exit 1
 fi
 
-# Find qbittorrent-nox binary across different LSIO image layouts
-QB_BIN=""
-for candidate in /app/qbittorrent-nox /usr/bin/qbittorrent-nox /usr/local/bin/qbittorrent-nox; do
-    if [[ -x "${candidate}" ]]; then
-        QB_BIN="${candidate}"
-        break
-    fi
-done
-
-if [[ -z "${QB_BIN}" ]]; then
-    bashio::log.fatal "qbittorrent-nox binary not found"
-    exit 1
-fi
-
 bashio::log.info "Starting qBittorrent..."
 
 # Suppress output in silent mode by redirecting the current shell's stdout/stderr
@@ -79,7 +67,7 @@ if bashio::config.true 'silent'; then
     exec >/dev/null 2>&1
 fi
 
-if [[ -z ${LSIO_NON_ROOT_USER} ]]; then
+if [[ -z ${LSIO_NON_ROOT_USER:-} ]]; then
     exec s6-setuidgid abc "${QB_BIN}" --webui-port="${WEBUI_PORT}"
 else
     exec "${QB_BIN}" --webui-port="${WEBUI_PORT}"