---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/50516#article
headline: "50516: Programmable Chat: Message index is not a number"
url: https://www.twilio.com/docs/api/errors/50516
inLanguage: en
dateModified: 2026-03-11T20:43:38.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 50516: Programmable Chat: Message index is not a number

Log Type: APPLICATION

Log Level: ERROR

## Description

Not a number string was provided as message index.

### Possible causes

* Some text or message sid was provided as message index

### Possible solutions

* Proper message index should be provided.