diff --git a/ha_addon_dev/config.yaml b/ha_addon_dev/config.yaml
index 1ef07f7..b492fd1 100755
--- a/ha_addon_dev/config.yaml
+++ b/ha_addon_dev/config.yaml
@@ -1,6 +1,6 @@
 name: TSUN-Proxy (Dev)
 description: MQTT Proxy for TSUN Photovoltaic Inverters
-version:  0.14.0-dev-2505311801 
+version:  0.14.0-dev-2505311821 
 image: docker.io/sallius/tsun-gen3-addon
 url: https://github.com/s-allius/tsun-gen3-proxy
 slug: tsun-proxy-dev
diff --git a/ha_addon_dev/rootfs/run.sh b/ha_addon_dev/rootfs/run.sh
index 8b8f932..9d54555 100755
--- a/ha_addon_dev/rootfs/run.sh
+++ b/ha_addon_dev/rootfs/run.sh
@@ -2,11 +2,16 @@
 
 echo "Add-on environment started"
 bashio::cache.flush_all
-echo "check for Home Assistant MQTT"
-MQTT_HOST=$(bashio::services mqtt "host")
-MQTT_PORT=$(bashio::services mqtt "port")
-MQTT_USER=$(bashio::services mqtt "username")
-MQTT_PASSWORD=$(bashio::services mqtt "password")
+echo "check for Home Assistant supervisor API"
+if bashio::supervisor.ping; then
+    echo "check for Home Assistant MQTT"
+    MQTT_HOST=$(bashio::services mqtt "host")
+    MQTT_PORT=$(bashio::services mqtt "port")
+    MQTT_USER=$(bashio::services mqtt "username")
+    MQTT_PASSWORD=$(bashio::services mqtt "password")
+else
+    echo "error Home Assistant supervisor API not available!"
+fi
 
 # if a MQTT was/not found, drop a note
 if [ -z "$MQTT_HOST" ]; then