RuntimeError: "Could not find fragment with id ......"

Using Streamlit
1

Hi All,

I have a web app that I created using Streamlit and deployed on Azure Web App Service. Previously, I did not experience any issues, but recently, after I started using @st.dialog(" ") and @st.cache_resource for logging, I began encountering an error. It’s important to note that I’m not using any fragments in my code.

Occasionally, when I open the web app, I encounter the following error:

RuntimeError: Could not find fragment with id 528f508d48a849e97fb463d969cf2108
Traceback:
File "/tmp/8dccee146dcecba/antenv/lib/python3.11/site-packages/streamlit/runtime/scriptrunner/exec_code.py", line 85, in exec_func_with_error_handling
    result = func()
             ^^^^^^
File "/tmp/8dccee146dcecba/antenv/lib/python3.11/site-packages/streamlit/runtime/scriptrunner/script_runner.py", line 560, in code_to_exec
    raise RuntimeError

Interestingly, the error disappears if I refresh the page, but it tends to pop up later again. I have encountered the error in the Azure Web App log stream as well:

Connected!
2024-09-11T21:15:49  Welcome, you are now connected to log-streaming service.Starting Log Tail -n 10 of existing logs ----/appsvctmp/volatile/logs/runtime/container.log
2024-09-11T17:34:06.8741032Z     raise RuntimeError(
2024-09-11T17:34:06.8741074Z RuntimeError: Could not find fragment with id 528f508d48a849e97fb463d969cf2108

Does anyone have any suggestions on how to diagnose or resolve this issue? Any insights would be greatly appreciated!

Streamlit version: Streamlit, version 1.38.0
Python version: Python 3.11.2

Thanks in advance!

1 Like
2

I have the same issue. How can we trace fragment ids to debug these errors?

3

A dialog is a fragment, so that’s likely to be the fragment in question. :slight_smile:

There were fragment bug fixes in both version 1.39.0 and 1.40.0. Would it be possible for you to confirm if this still happens on the latest version of Streamlit?

5

@mathcatsand I am currently using streamlit 1.40.0 and regularly get these errors:

Traceback (most recent call last):
  File "...\streamlit\runtime\scriptrunner\script_runner.py", line 88, in exec_func_with_error_handling
    result = func()
  File "...\streamlit\runtime\scriptrunner\script_runner.py", line 563, in code_to_exec
    raise RuntimeError(
RuntimeError: Could not find fragment with id c0737d868aa8bcf378c7f91d8bd89269
2024-12-17 10:54:25.355 Uncaught app exception
Traceback (most recent call last):
  File "...\streamlit\runtime\scriptrunner\script_runner.py", line 117, in get
    return self._fragments[key]
KeyError: 'c0737d868aa8bcf378c7f91d8bd89269'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "...\streamlit\runtime\scriptrunner\exec_code.py", line 88, in exec_func_with_error_handling
    result = func()
  File "...\streamlit\runtime\scriptrunner\script_runner.py", line 563, in code_to_exec
    raise RuntimeError(
RuntimeError: Could not find fragment with id c0737d868aa8bcf378c7f91d8bd89269

Would love to know how to traceback, just getting this error is frustrating.

6

Are you able to reproduce the error locally, or is this just something that happens on Azure? Can you share your app’s code?

7

This happens locally for me. My code is pretty long but even a simple code like the below triggers it. At times when using nested fragments, unclear which fragment is causing the error. Very frustrating.


@st.fragment
def right_container():
      
     st.write("**CV Section**")
      
     if "cv_data" not in st.session_state:  
         st.session_state["cv_data"] = []

     ## cv sections
     with st.expander("Contact Details"):
         parts_cols = st.columns(2)
         parts_cols[0].text_input("first name", placeholder="first name")
         parts_cols[1].text_input("last name", placeholder="last name")
         parts_cols[0].text_input("phone number", placeholder="phone number")

   
right_container()
8

What steps do I need to do to reproduce the error? I’m unable to reproduce the error with that code snippet (after adding the Streamlit import statement).

9

Not entirely sure. Though often it seems to occur after periods of inactivity even when the page is in current view. So if I don’t interact with the page in view (displayed on screen) for some minutes, then click a button the error comes .