diff --git a/docker/src/s6-services/s6-init-dcs-server-autostart-longrun/run b/docker/src/s6-services/s6-init-dcs-server-autostart-longrun/run
index d929a60..8f16373 100755
--- a/docker/src/s6-services/s6-init-dcs-server-autostart-longrun/run
+++ b/docker/src/s6-services/s6-init-dcs-server-autostart-longrun/run
@@ -38,6 +38,13 @@ if [ ! -f "$network_vault_path" ]; then
     exit 1
 fi
 
+dcs_lock_file="${DCS_saved_games_dir_release}/dcs.lock"
+if [ -f "$dcs_lock_file" ]; then
+    echo "Error: File '$dcs_lock_file' is present. Server is already running or lockfile must be manually removed by user. Cannot autostart. Exiting." 
+    sleep $TIMEOUT
+    exit 1
+fi
+
 install_folder_path="/config/.wine/drive_c/Program Files/Eagle Dynamics"
 if [ ! -d "$install_folder_path" ]; then
     echo "No installation detected. Cannot autostart. Exiting"