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

0.6.42, 0.6.43

Ollama Version (if applicable)

N/A

Operating System

N/A

Browser (if applicable)

N/A

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

Opening the URL, frontend should load.

Actual Behavior

Only sidebar loads, loading animation stays in place, error in browser console:

Steps to Reproduce

Log in to Open WebUI, create an External Tool connection, like this:

Save it, enable it.

---> Frontend still works at this point flawlessly!

Hit Ctrl-F5 in browser, frontend stuck in loading state, with error on console:

Use Settings to disable the External tool:

Hit Ctrl-F5 again - frontend works correctly again.

Logs & Screenshots

Open WebUI JS error when External tool MCP definition active:

Uncaught (in promise) TypeError: Cannot convert undefined or null to object
    at Object.entries (<anonymous>)
    at d1 (index.ts:1253:39)
    at index.ts:388:15
    at Array.map (<anonymous>)
    at Ss (index.ts:349:6)
    at Q (+layout.svelte:119:31)
    at +layout.svelte:159:37
    at te (+layout.svelte:105:10)
    at async Promise.all (:3000/index 3)
    at async +layout.svelte:154:9

Frontend in permanent loading state:

Additional Information

Tested in 0.6.42 and 0.6.43 too.

Frontend does work if the External tools are not enabled when the browser starts the session, and stuff breaks with a Ctrl-F5.