this

app.py

@@ -53,7 +53,7 @@ def Login():
         for anyuser in allusers:
             if  username == anyuser["username"] and password == anyuser["password"]:
                 st.success("You are logged in")
-                st.session_state["username"] = "isuser"
+                st.session_state["user"] = "isuser"
                 st.experimental_rerun()
             else:
                 st.error("Your username or password do not match")
@@ -61,7 +61,7 @@ def Login():
 
 
 def main():
-    if st.session_state["username"] == "Guest":
+    if st.session_state["user"] == "Guest":
         with st.sidebar:
             selected = option_menu("Menu", ["Login", "Signup"], icons = ["house", "person"])
         if selected == "Login":