Bug st.toast breaks the app when executed from a callback
Author: injenieroCreated May 15, 2025Updated Sep 16, 2026
Labelstype:bugstatus:confirmedpriority:P3feature:st.toastfeature:st.dialog
Checklist
- I have searched the existing issues for similar issues.
- I added a very descriptive title to this issue.
- I have provided sufficient information below to help reproduce this issue.
Summary
st.toast breaks the app when executed from a callback within a dialogue.
Reproducible Code Example
import streamlit as st
def on_click_callback():
st.toast("This is a toast notification!", icon="")
@st.dialog(title="Streamlit Toast Notification", width="large")
def toast_notification():
st.markdown("## Toast Notification")
st.button("Show Toast", on_click=on_click_callback)
if st.button("Show Dialogue"):
toast_notification()
Steps To Reproduce
click the button to show the dialogue, then click on the button on the dialogue
Expected Behavior
It should not break the app
Current Behavior
It render the page white and the JS console shows
Is this a regression?
- Yes, this used to work in a previous version.
Debug info
- Streamlit version: 1.45.0
- Python version: 3.11.11
- Operating System: macos
- Browser: Chrome
Additional Information
No response
Source: streamlit/streamlit