[GH-ISSUE #23988] issue: __event_emitter__ pipe field is not set for subsequent requests after tool calls

Originally created by @moritzderallerechte on GitHub (Apr 22, 2026). Original GitHub issue: https://github.com/open-webui/open-webui/issues/23988 ### Check Existing Issues - [x] I have searched for any existing and/or related issues. - [x] I have searched for any existing and/or related discussions. - [x] I have also searched in the CLOSED issues AND CLOSED discussions and found no related items (your issue might already be addressed on the development branch!). - [x] I am using the latest version of Open WebUI. ### Installation Method Git Clone ### Open WebUI Version v0.9.1 ### Ollama Version (if applicable) _No response_ ### Operating System Ubuntu ### Browser (if applicable) _No response_ ### Confirmation - [x] I have read and followed all instructions in `README.md`. - [x] I am using the latest version of **both** Open WebUI and Ollama. - [x] I have included the browser console logs. - [x] I have included the Docker container logs. - [x] I have **provided every relevant configuration, setting, and environment variable used in my setup.** - [x] I have clearly **listed every relevant configuration, custom setting, environment variable, and command-line option that influences my setup** (such as Docker Compose overrides, .env values, browser settings, authentication configurations, etc). - [x] I have documented **step-by-step reproduction instructions that are precise, sequential, and leave nothing to interpretation**. My steps: - Start with the initial platform/version/OS and dependencies used, - Specify exact install/launch/configure commands, - List URLs visited, user input (incl. example values/emails/passwords if needed), - Describe all options and toggles enabled or changed, - Include any files or environmental changes, - Identify the expected and actual result at each stage, - Ensure any reasonably skilled user can follow and hit the same issue. ### Expected Behavior Using a pipe, when a model calls tools from OWUI and the generation is continued afterwards, the subsequent calls to the pipe(...) function should have the __event_emitter__ field set like usual. ### Actual Behavior The __event_emitter__ field is _None_ after the first tool call. ### Steps to Reproduce 1. Have a pipe function that calls __event_emitter__ 2. Ask the model to do a tool call 3. TypeError: 'NoneType' object is not callable ### Logs & Screenshots Below is a shortened log of a pipe function that does `logger.info(f"__event_emitter__: {__event_emitter__}")` at the very beginning. > **function:pipe:1035 - __event_emitter__: <function get_event_emitter.<locals>.__event_emitter__ at 0x79a2099b9080>** > function:pipe:1036 - task: None > function:pipe:1037 - task body: > ... > function:process:919 - Streaming API response > ... > function:pipe:1189 - pipe function done > open_webui.retrieval.utils:query_collection_with_hybrid_search:623 - Starting hybrid search for 1 queries in 1 collections... > open_webui.retrieval.utils:query_doc_with_hybrid_search:432 - query_doc_with_hybrid_search:result [...] > **function:pipe:1035 - __event_emitter__: None** > function:pipe:1036 - task: None > function:pipe:1037 - task body: > ... > function:process_openrouter_response:919 - Streaming API response! > ... > function:raise_status_message:274 - raise_status_message > function:pipe:1192 - Traceback (most recent call last): > File "<string>", line 1183, in pipe > File "<string>", line 1023, in process > File "<string>", line 276, in raise_status_message ### Additional Information This issue did not exists in v0.8.12

GiteaMirror commented

2026-05-15 16:09:39 -05:00

Owner

Originally created by @moritzderallerechte on GitHub (Apr 22, 2026).
Original GitHub issue: https://github.com/open-webui/open-webui/issues/23988

Check Existing Issues

I have searched for any existing and/or related issues.
I have searched for any existing and/or related discussions.
I have also searched in the CLOSED issues AND CLOSED discussions and found no related items (your issue might already be addressed on the development branch!).
I am using the latest version of Open WebUI.

Installation Method

Git Clone

Open WebUI Version

v0.9.1

Ollama Version (if applicable)

No response

Operating System

Ubuntu

Browser (if applicable)

Confirmation

I have read and followed all instructions in README.md.
I am using the latest version of both Open WebUI and Ollama.
I have included the browser console logs.
I have included the Docker container logs.
I have provided every relevant configuration, setting, and environment variable used in my setup.
I have clearly listed every relevant configuration, custom setting, environment variable, and command-line option that influences my setup (such as Docker Compose overrides, .env values, browser settings, authentication configurations, etc).
I have documented step-by-step reproduction instructions that are precise, sequential, and leave nothing to interpretation. My steps:
Start with the initial platform/version/OS and dependencies used,
Specify exact install/launch/configure commands,
List URLs visited, user input (incl. example values/emails/passwords if needed),
Describe all options and toggles enabled or changed,
Include any files or environmental changes,
Identify the expected and actual result at each stage,
Ensure any reasonably skilled user can follow and hit the same issue.

Expected Behavior

Using a pipe, when a model calls tools from OWUI and the generation is continued afterwards, the subsequent calls to the pipe(...) function should have the event_emitter field set like usual.

Actual Behavior

The event_emitter field is None after the first tool call.

Steps to Reproduce

Have a pipe function that calls event_emitter
Ask the model to do a tool call
TypeError: 'NoneType' object is not callable

Logs & Screenshots

Below is a shortened log of a pipe function that does
logger.info(f"__event_emitter__: {__event_emitter__}")
at the very beginning.

function:pipe:1035 - event_emitter: <function get_event_emitter..event_emitter at 0x79a2099b9080>
function:pipe:1036 - task: None
function:pipe:1037 - task body:
...
function:process:919 - Streaming API response
...
function:pipe:1189 - pipe function done
open_webui.retrieval.utils:query_collection_with_hybrid_search:623 - Starting hybrid search for 1 queries in 1 collections...
open_webui.retrieval.utils:query_doc_with_hybrid_search:432 - query_doc_with_hybrid_search:result [...]
function:pipe:1035 - event_emitter: None
function:pipe:1036 - task: None
function:pipe:1037 - task body:
...
function:process_openrouter_response:919 - Streaming API response!
...
function:raise_status_message:274 - raise_status_message
function:pipe:1192 - Traceback (most recent call last):
File "", line 1183, in pipe
File "", line 1023, in process
File "", line 276, in raise_status_message

Additional Information

This issue did not exists in v0.8.12

GiteaMirror added the bug label 2026-05-15 16:09:39 -05:00

GiteaMirror closed this issue

2026-05-15 16:09:40 -05:00

Author

@tjbck commented on GitHub (Apr 24, 2026):

Addressed in dev.

@tjbck commented on GitHub (Apr 24, 2026): Addressed in dev.

[GH-ISSUE #23988] issue: __event_emitter__ pipe field is not set for subsequent requests after tool calls #90880