Update app.py

app.py

@@ -9,9 +9,13 @@ st.title("Cohere Chat UI")
 if "api_key" not in st.session_state:
     api_key = st.text_input("Enter your API Key", type="password")
     if api_key:
-        st.session_state.api_key = api_key
-        client = cohere.Client(api_key=api_key)
-        st.rerun()
+        if isascii(api_key):
+            st.session_state.api_key = api_key
+            client = cohere.Client(api_key=api_key)
+            st.rerun()
+        else:
+            st.warning("Please enter your API key correctly.")
+            st.stop()
     else:
         st.warning("Please enter your API key to use the app. You can obtain your API key from here: https://dashboard.cohere.com/api-keys")
         st.stop()
@@ -179,7 +183,7 @@ with st.sidebar:
     st.header("Change API Key")
     new_api_key = st.text_input("Enter new API Key", type="password")
     if st.button("Update API Key"):
-        if new_api_key:
+        if new_api_key and isascii(new_api_key):
             st.session_state.api_key = new_api_key
             client = cohere.Client(api_key=new_api_key)
             st.success("API Key updated successfully!")