Warning: Undefined array key 0 in Drupal\Core\Database\Query\Condition->condition() (line 114 of core/lib/Drupal/Core/Database/Query/Condition.php)

Added the patch to resolve the issue

Prashant.c → made their first commit to this issue’s fork.

This patch is not applying on 10.1.x or 11.x. Request you to re-submit the patch.

Made new patch to bypass the error in said condition with an index verification:

$value = $value[0];
To
$value = isset($value[0]) ? $value[0] : $value;

Worked for me.

I followed the steps in the IS after installing standard profile and was unable to reproduce the error.

Can the steps be updated starting with Installing Drupal?

It has been over 3 months with no response, I am closing this as cannot reproduce.

If you are able to provide steps to reproduce this issue from a fresh Drupal install, please feel free to reopen this issue and add those steps to the issue summary. Thanks!