Update app.py

app.py

@@ -20,7 +20,8 @@ if not os.path.exists(lock_file_path):
     with open(lock_file_path, "w") as f:
         f.write("Running!")
 else:
-    print("Streamlit app is already running.")
+    print("Streamlit app is already running, exiting this instance.")
+    exit()
 
 try:
     os.mkdir("data")