diff --git a/traccar/rootfs/etc/cont-init.d/traccar.sh b/traccar/rootfs/etc/cont-init.d/traccar.sh
index 3e75ef6..b81175a 100644
--- a/traccar/rootfs/etc/cont-init.d/traccar.sh
+++ b/traccar/rootfs/etc/cont-init.d/traccar.sh
@@ -3,6 +3,24 @@
 # Home Assistant Community Add-on: Traccar
 # Ensures the user configuration file is present
 # ==============================================================================
+declare host
+declare password
+declare port
+declare username
+
 if ! bashio::fs.file_exists "/config/traccar.xml"; then
     cp /etc/traccar/traccar.xml /config/traccar.xml
+else
+    # Existing installation
+    if bashio::services.available "mysql"; then
+        # Make sure the database isn't locked
+        host=$(bashio::services "mysql" "host")
+        password=$(bashio::services "mysql" "password")
+        port=$(bashio::services "mysql" "port")
+        username=$(bashio::services "mysql" "username")
+
+        echo "UPDATE DATABASECHANGELOGLOCK SET locked=0;" \
+            | mysql -h "${host}" -P "${port}" -u "${username}" -p"${password}" \
+                traccar
+    fi
 fi