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[PR #31416] fix: NextStep crash when target node is missing #33226

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opened 2026-02-21 20:52:53 -05:00 by yindo · 0 comments
yindo commented 2026-02-21 20:52:53 -05:00
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Original Pull Request: https://github.com/langgenius/dify/pull/31416

State: closed
Merged: Yes

Important

  1. Make sure you have read our contribution guidelines
  2. Ensure there is an associated issue and you have been assigned to it
  3. Use the correct syntax to link this PR: Fixes #<issue number>.

Summary

Prevents NextStep from crashing by skipping edges whose target nodes are unavailable.

Issue

The next.js throw client error when I try to set an LLM node to use structured output, the error reports is:

## Error Type
Runtime TypeError

## Error Message
can't access property "id", nextNode is undefined


    at Container/<.children< (app/components/workflow/nodes/_base/components/next-step/container.tsx:49:13)
    at Container (app/components/workflow/nodes/_base/components/next-step/container.tsx:46:19)
    at NextStep/<.children<.children< (app/components/workflow/nodes/_base/components/next-step/index.tsx:106:15)
    at NextStep (app/components/workflow/nodes/_base/components/next-step/index.tsx:104:16)
    at BasePanel (app/components/workflow/nodes/_base/components/workflow-panel/index.tsx:650:19)
    at _c1< (app/components/workflow/nodes/index.tsx:49:7)
    at Panel (app/components/workflow/panel/index.tsx:134:26)
    at WorkflowPanel (app/components/workflow-app/components/workflow-panel.tsx:129:5)
    at WorkflowChildren (app/components/workflow-app/components/workflow-children.tsx:192:7)
    at WorkflowMain (app/components/workflow-app/components/workflow-main.tsx:186:7)
    at WorkflowAppWithAdditionalContext (app/components/workflow-app/index.tsx:203:9)
    at WorkflowAppWrapper (app/components/workflow-app/index.tsx:218:7)
    at Page (app/(commonLayout)/app/(appDetailLayout)/[appId]/workflow/page.tsx:6:7)

## Code Frame
  47 |           <Item
  48 |             key={nextNode.id}
> 49 |             nodeId={nextNode.id}
     |             ^
  50 |             data={nextNode.data}
  51 |             sourceHandle="source"
  52 |           />

Next.js version: 16.1.4 (Turbopack)

Cause

The crash happens because the UI assumes every outgoing edge’s target node exists. When an edge points to a node that isn’t in the current outgoers list (e.g., deleted, filtered, or not yet loaded), outgoers.find(...) returns undefined, but the code still tries to read nextNode.id. That throws TypeError: can't access property "id", nextNode is undefined.

Screenshots

Before After
N/A N/A

Checklist

  • This change requires a documentation update, included: Dify Document
  • I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
  • I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
  • I've updated the documentation accordingly.
  • I ran make lint and make type-check (backend) and cd web && npx lint-staged (frontend) to appease the lint gods
**Original Pull Request:** https://github.com/langgenius/dify/pull/31416 **State:** closed **Merged:** Yes --- > [!IMPORTANT] > > 1. Make sure you have read our [contribution guidelines](https://github.com/langgenius/dify/blob/main/CONTRIBUTING.md) > 1. Ensure there is an associated issue and you have been assigned to it > 1. Use the correct syntax to link this PR: `Fixes #<issue number>`. ## Summary Prevents NextStep from crashing by skipping edges whose target nodes are unavailable. ### Issue The next.js throw client error when I try to set an LLM node to use structured output, the error reports is: ``` ## Error Type Runtime TypeError ## Error Message can't access property "id", nextNode is undefined at Container/<.children< (app/components/workflow/nodes/_base/components/next-step/container.tsx:49:13) at Container (app/components/workflow/nodes/_base/components/next-step/container.tsx:46:19) at NextStep/<.children<.children< (app/components/workflow/nodes/_base/components/next-step/index.tsx:106:15) at NextStep (app/components/workflow/nodes/_base/components/next-step/index.tsx:104:16) at BasePanel (app/components/workflow/nodes/_base/components/workflow-panel/index.tsx:650:19) at _c1< (app/components/workflow/nodes/index.tsx:49:7) at Panel (app/components/workflow/panel/index.tsx:134:26) at WorkflowPanel (app/components/workflow-app/components/workflow-panel.tsx:129:5) at WorkflowChildren (app/components/workflow-app/components/workflow-children.tsx:192:7) at WorkflowMain (app/components/workflow-app/components/workflow-main.tsx:186:7) at WorkflowAppWithAdditionalContext (app/components/workflow-app/index.tsx:203:9) at WorkflowAppWrapper (app/components/workflow-app/index.tsx:218:7) at Page (app/(commonLayout)/app/(appDetailLayout)/[appId]/workflow/page.tsx:6:7) ## Code Frame 47 | <Item 48 | key={nextNode.id} > 49 | nodeId={nextNode.id} | ^ 50 | data={nextNode.data} 51 | sourceHandle="source" 52 | /> Next.js version: 16.1.4 (Turbopack) ``` ### Cause The crash happens because the UI assumes every outgoing edge’s target node exists. When an edge points to a node that isn’t in the current outgoers list (e.g., deleted, filtered, or not yet loaded), outgoers.find(...) returns undefined, but the code still tries to read nextNode.id. That throws TypeError: can't access property "id", nextNode is undefined. ## Screenshots | Before | After | |--------|-------| | N/A | N/A | ## Checklist - [ ] This change requires a documentation update, included: [Dify Document](https://github.com/langgenius/dify-docs) - [x] I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!) - [ ] I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change. - [ ] I've updated the documentation accordingly. - [ ] I ran `make lint` and `make type-check` (backend) and `cd web && npx lint-staged` (frontend) to appease the lint gods
yindo added the pull-request label 2026-02-21 20:52:53 -05:00
yindo closed this issue 2026-02-21 20:52:54 -05:00
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Reference: langgenius/dify#33226
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