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[GH-ISSUE #19340] issue: Generate Title for Chat returns "Model Not Found" when Model Is not available for use #34375

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opened 2026-04-25 08:19:36 -05:00 by GiteaMirror · 1 comment
GiteaMirror commented 2026-04-25 08:19:36 -05:00
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Originally created by @panuud on GitHub (Nov 21, 2025).
Original GitHub issue: https://github.com/open-webui/open-webui/issues/19340

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

Docker

Open WebUI Version

0.6.36

Ollama Version (if applicable)

No response

Operating System

Ubuntu 22.04

Browser (if applicable)

No response

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

When the TASK_MODEL or TASK_MODEL_EXTERNAL is configured in Interface Settings, the title generation function should use these configured models as a model for title creation.

Actual Behavior

The system returns a "Model not found" error when attempting to generate a title, even when TASK_MODEL and TASK_MODEL_EXTERNAL is properly set.

Steps to Reproduce

  1. Configure a model for TASK_MODEL and TASK_MODEL_EXTERNAL in Interface Settings.
  2. Delete the model currently associated with a chat session.
  3. Verify the chat interface shows "Select a Model" (indicating the model is missing).
  4. Click the title generation button in the left sidebar.
  5. Observe the "Model not found" error instead of successful title generation.

Logs & Screenshots

Image

Additional Information

The issue likely occurs in open-webui/backend/open_webui/routers/tasks.py within the generate_title function. The current implementation checks only the available models list but doesn't fall back to the configured TASK_MODEL or TASK_MODEL_EXTERNAL values, so When the original model is missing, it triggers an exception. This may relate to #18896

Originally created by @panuud on GitHub (Nov 21, 2025). Original GitHub issue: https://github.com/open-webui/open-webui/issues/19340 ### 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 Docker ### Open WebUI Version 0.6.36 ### Ollama Version (if applicable) _No response_ ### Operating System Ubuntu 22.04 ### 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 When the TASK_MODEL or TASK_MODEL_EXTERNAL is configured in Interface Settings, the title generation function should use these configured models as a model for title creation. ### Actual Behavior The system returns a "Model not found" error when attempting to generate a title, even when TASK_MODEL and TASK_MODEL_EXTERNAL is properly set. ### Steps to Reproduce 1. Configure a model for TASK_MODEL and TASK_MODEL_EXTERNAL in Interface Settings. 2. Delete the model currently associated with a chat session. 3. Verify the chat interface shows "Select a Model" (indicating the model is missing). 4. Click the title generation button in the left sidebar. 5. Observe the "Model not found" error instead of successful title generation. ### Logs & Screenshots ![Image](https://github.com/user-attachments/assets/1a977280-9f6f-4e77-9908-db91c79f7b41) ### Additional Information The issue likely occurs in open-webui/backend/open_webui/routers/tasks.py within the generate_title function. The current implementation checks only the available models list but doesn't fall back to the configured TASK_MODEL or TASK_MODEL_EXTERNAL values, so When the original model is missing, it triggers an exception. This may relate to #18896
GiteaMirror added the bug label 2026-04-25 08:19:36 -05:00
GiteaMirror commented 2026-04-25 08:19:38 -05:00
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@tjbck commented on GitHub (Nov 21, 2025):

Unable to reproduce, are your task models public models?

<!-- gh-comment-id:3562153801 --> @tjbck commented on GitHub (Nov 21, 2025): Unable to reproduce, are your task models public models?
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Reference: github-starred/open-webui#34375
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