Update app.py

app.py

@@ -83,16 +83,17 @@ def user_login_create():
     global TBYB_LOGO
     global USER_LOGGED_IN
     users = None
-    with open(USER_DATABASE_PATH) as file:
-        users = yaml.load(file, Loader=SafeLoader)
-        AUTHENTICATOR = stauth.Authenticate(
-            users['credentials'],
-            users['cookie']['name'],
-            users['cookie']['key'],
-            users['cookie']['expiry_days'],
-            users['preauthorized']
-        )
-        
+    with USER_DATABASE_UPDATE_SCHEDULER.lock:
+        with open(USER_DATABASE_PATH) as file:
+            users = yaml.load(file, Loader=SafeLoader)
+            AUTHENTICATOR = stauth.Authenticate(
+                users['credentials'],
+                users['cookie']['name'],
+                users['cookie']['key'],
+                users['cookie']['expiry_days'],
+                users['preauthorized']
+            )
+            
     with st.sidebar:
         st.image(TBYB_LOGO, width=70)
         loginTab, registerTab, detailsTab = st.tabs(["Log in", "Register", "Account details"])