[PR #20996] [CLOSED] fix: prevent empty embeds from rendering as {} in tool calls UI #41500

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GiteaMirror · 2026-04-25T13:43:49-05:00

GiteaMirror commented

2026-04-25 13:43:49 -05:00

📋 Pull Request Information

Original PR: https://github.com/open-webui/open-webui/pull/20996
Author: @cannontrodder
Created: 1/28/2026
Status: ❌ Closed

Base: main ← Head: fix/empty-embeds-rendering

📝 Commits (1)

04adf5a fix: prevent empty embeds from rendering as {} in tool calls UI

📊 Changes

1 file changed (+2 additions, -2 deletions)

View changed files

📝 backend/open_webui/utils/middleware.py (+2 -2)

📄 Description

Summary

Fixes #20991

When a tool call has no embeds, an empty {} is incorrectly rendered in the UI along with a JavaScript console error: SyntaxError: JSON.parse: unexpected character at line 1 column 1.

Changes

Changed default value for tool_result_embeds from "" to [] (line 2388)
Only include embeds attribute in HTML when non-empty, matching the pattern used for files (line 2389)

Root Cause

The empty string default "" gets JSON-encoded to '""' and HTML-escaped. The frontend's parseJSONString() then fails to parse this, causing the JSON parse error and {} being rendered as a fallback.

Testing

Before: Tool calls without embeds show {} in red box and SyntaxError: JSON.parse: unexpected character at line 1 column 1 in console
After: Tool calls without embeds render cleanly with no spurious content

Test environment

OpenWebUI with AWS Bedrock backend via LiteLLM
Custom tools returning markdown (no embeds)

Checklist

Code follows project style guidelines
Minimal change to fix the issue
No breaking changes to existing functionality
Personally tested all changes

Contributor License Agreement

By submitting this pull request, I confirm that I have read and fully agree to the Contributor License Agreement (CLA), and I am providing my contributions under its terms.

_{🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.}

## 📋 Pull Request Information **Original PR:** https://github.com/open-webui/open-webui/pull/20996 **Author:** [@cannontrodder](https://github.com/cannontrodder) **Created:** 1/28/2026 **Status:** ❌ Closed **Base:** `main` ← **Head:** `fix/empty-embeds-rendering` --- ### 📝 Commits (1) - [`04adf5a`](https://github.com/open-webui/open-webui/commit/04adf5a63e8887495305452dd5f63e446a7f312c) fix: prevent empty embeds from rendering as {} in tool calls UI ### 📊 Changes **1 file changed** (+2 additions, -2 deletions) <details> <summary>View changed files</summary> 📝 `backend/open_webui/utils/middleware.py` (+2 -2) </details> ### 📄 Description ## Summary Fixes #20991 When a tool call has no embeds, an empty `{}` is incorrectly rendered in the UI along with a JavaScript console error: `SyntaxError: JSON.parse: unexpected character at line 1 column 1`. ## Changes - Changed default value for `tool_result_embeds` from `""` to `[]` (line 2388) - Only include `embeds` attribute in HTML when non-empty, matching the pattern used for `files` (line 2389) ## Root Cause The empty string default `""` gets JSON-encoded to `'""'` and HTML-escaped. The frontend's `parseJSONString()` then fails to parse this, causing the JSON parse error and `{}` being rendered as a fallback. ## Testing - **Before:** Tool calls without embeds show `{}` in red box and `SyntaxError: JSON.parse: unexpected character at line 1 column 1` in console - **After:** Tool calls without embeds render cleanly with no spurious content ### Test environment - OpenWebUI with AWS Bedrock backend via LiteLLM - Custom tools returning markdown (no embeds) ## Checklist - [x] Code follows project style guidelines - [x] Minimal change to fix the issue - [x] No breaking changes to existing functionality - [x] Personally tested all changes ### Contributor License Agreement By submitting this pull request, I confirm that I have read and fully agree to the [Contributor License Agreement (CLA)](https://github.com/open-webui/open-webui/blob/main/CONTRIBUTOR_LICENSE_AGREEMENT), and I am providing my contributions under its terms. --- <sub>🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.</sub>

GiteaMirror added the pull-request label 2026-04-25 13:43:49 -05:00

GiteaMirror closed this issue

2026-04-25 13:43:50 -05:00

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Reference: github-starred/open-webui#41500