primefaces/primeng

Table: Multisort tries to access invalid index

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#19572 opened on May 11, 2026

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Type: Buggood first issue

Description

Describe the bug

When the multiSortMeta of the table is, for some reason, an empty array, the table tries to access an invalid index. This leads to unexpected behavior in our application.

TypeError: Cannot read properties of undefined (reading 'field')
    at i.multisortField (http://localhost:4200/chunk-5KJFCQPK.js:3048:17941)
    at http://localhost:4200/chunk-5KJFCQPK.js:3048:17680
    at Array.sort (<anonymous>)
    at i.sortMultiple (http://localhost:4200/chunk-5KJFCQPK.js:3048:17663)
    at i.onChanges (http://localhost:4200/chunk-5KJFCQPK.js:3048:13126)
    at i.ngOnChanges (http://localhost:4200/chunk-T7OEMV3O.js:156:9838)
    at i.lA (http://localhost:4200/chunk-T7OEMV3O.js:4:18716)
    at O_ (http://localhost:4200/chunk-T7OEMV3O.js:4:20279)
    at fA (http://localhost:4200/chunk-T7OEMV3O.js:4:20434)

Pull Request Link

https://github.com/primefaces/primeng/pull/19573

Reproducer

https://stackblitz.com/edit/github-kfctoa6w?file=src%2Fapp%2Fapp.component.html

Environment

PrimeNG: 20.4.0 Angular: 20 Browsers: Firefox, Chromium based browsers

Angular version

20.3.19

PrimeNG version

v20

Node version

24.13.0

Browser(s)

No response

Steps to reproduce the behavior

Filling the [multiSortMeta] of the Table Component with an empty array leads to the console error.

Expected behavior

The table component should be able to handle an empty array instead of throwing errors.

Contributor guide

Tech stack
typescripthtmlcss
Domain
frontend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
under 1 hour
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
blocked
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Angular basicsPrimeNG table component
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
The bug occurs in the table component's multisortField and sortMultiple methods when multiSortMeta is an empty array. The fix likely involves checking for an empty array before accessing indices. The linked PR #19573 provides a solution; review it to ensure correctness. Also, consider adding a unit test for this edge case.