Comfy-Org/ComfyUI_frontend

1.27.5 - Cant convert nodes to subgraph

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#5,630 opened on Sep 18, 2025

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Potential Bugarea:subgraphhelp wanted

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Description

Prerequisites

  • I am running the latest version of ComfyUI

Errors in console 

Uncaught TypeError: Cannot read properties of null (reading 'links')
    at setgetnodes.js:452:32
    at Array.filter (<anonymous>)
    at GetNode.validateLinks (setgetnodes.js:451:29)
    at GetNode.onConnectionsChange (setgetnodes.js:417:11)
    at GetNode.configure (LGraphNode.ts:816:14)
    at multiClone (subgraphUtils.ts:228:13)
    at LGraph.convertToSubgraph (LGraph.ts:1509:25)
    at app.graph.convertToSubgraph (use_everywhere.js:371:45)
    at HTMLDivElement.callback (LGraphCanvas.ts:8060:29)
    at HTMLDivElement.n (extensions-DFtJQYTL.js:1:144819)

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Contributor guide

Research direction
Examine the GetNode.validateLinks method in setgetnodes.js to understand why it's being called on a null node. Check the subgraph conversion flow in subgraphUtils.ts and LGraph.ts to identify where the null node originates.
Tech stack
typescript
Domain
frontend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
TypeScriptGit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30