Error when user is not found

Created on 18 July 2025, 18 days ago

Problem/Motivation

When a user enters an invalid Drupal.org username during registration, the following fatal error occurs:

Error: Call to a member function __isset() on null in Drupal\do_username\DOUserInfoRetriever->isValidUser() (line 79 of modules/contrib/do_username/src/DOUserInfoRetriever.php)

This happens because the code attempts to call __isset() on a null value when the user validation fails.

Steps to reproduce

Install the do_username → module.
Configure a field using the module in a user profile (e.g., using the Profile → module).
Visit the user registration page.
Enter an invalid Drupal.org username.
Submit the form.

Expected behavior: A validation message should appear stating that the username is invalid.

Actual behavior: A fatal error is thrown.

Proposed resolution

Add a null check to ensure that getUserInformation() returns a valid value before calling __isset() or any other method on it.

Remaining tasks

Add null check in DOUserInfoRetriever::isValidUser().
Write/update test coverage (if applicable).
Review and merge the patch.

User interface changes

None.

API changes

None.

Data model changes

None.

🐛 Bug report

Status

Active

Version

2.0

Component

Code

Created by

🇮🇳India divyansh

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Comments & Activities

Issue created by @divyansh
Comment 18 days ago →
🇮🇳India divyansh
Split null check and method call to prevent fatal error when getUserInformation() returns NULL for non-existent drupal.org users.
Comment 18 days ago →
🇮🇳India divyansh
Comment 18 days ago →
🇮🇳India divyansh
Comment 11 days ago →
bhogue
Can confirm.

I replicated issue on a DrupalPod environment, getting the same error as above when entering an invalid Drupal.org username using the field provided by the module.

After applying the patch and again supplying an invalid Drupal.org username, an error message appears on the form and the field is highlighted as an error.

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