---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/90020#article
headline: "90020: One of 'TemplateArgs' dictionary key is blank"
url: https://www.twilio.com/docs/api/errors/90020
inLanguage: en
dateModified: 2026-06-08T11:38:30.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 90020: One of 'TemplateArgs' dictionary key is blank

Log Type: APPLICATION

Log Level: ERROR

## Description

This error occurs when a template message request includes `TemplateArgs` and at least one dictionary key is blank. Use a non-empty key for every template argument so Twilio can match each substitution to the correct placeholder in the template.

### Possible causes

* The `TemplateArgs` object includes an empty key.
* Your application builds `TemplateArgs` dynamically and one variable name resolves to a blank value before the request is sent.
* The request payload is serialized or transformed incorrectly, which leaves one of the `TemplateArgs` keys blank.
* A template tag is referenced in the template body, but the corresponding key in `TemplateArgs` is empty.

### Possible solutions

* Remove empty keys from `TemplateArgs` and resend the request.
* Make sure every `TemplateArgs` key is a non-empty string that matches the placeholder you want to populate.
* Validate and trim dynamically generated keys before you submit the message request.
* Review the final request payload your application sends and confirm `TemplateArgs` contains only valid key-value pairs.
* If you are building new template sends, use `ContentSid` with properly formatted `ContentVariables` in the Messages resource.

#### Additional resources

* [Messages resource](/docs/messaging/api/message-resource)
* [Using Variables with Content Templates](/docs/content/using-variables-with-content-api)
* [Send WhatsApp notification messages with templates](/docs/whatsapp/tutorial/send-whatsapp-notification-messages-templates)