Knowledge Base

Unable to log in to the WP Admin dashboard by using WP Toolkit: JSON: Illegal Token

Unable to log in to the WP Admin dashboard by using WP Toolkit at Domains > example.com > WordPress tab > Log In button:

An error has occurred when decoding JSON by Zend_Json: Illegal Token
Same error is displayed in during the following operations as well:
Domains > example.com > WordPress > Updates > Check for updates
Domains > example.com > WordPress > Clone
The following log is found in at /var/log/plesk/panel.log with Debug enabled:

DEBUG [util_exec] Finished in 0.6062s, Error code: 0, stdout: "https://www.example.com/wp-login.php"
PHP: [notice X 0][/var/www/vhosts/example.com/httpdocs/wp-content/plugins/elementor-pro/modules/loop-builder/module.php::200] strpos(): Passing null to parameter #1 ($haystack) of type string is deprecated [array (
'trace' => '
0: ElementorCoreLoggerManager -> shutdown()
',
)]

[extension/wp-toolkit] An error has occurred when decoding JSON by json_decode: Syntax error
JSON: "https://example.com/wp-login.php"
PHP: 2023-09-19 13:36:23 [notice X 0][/var/www/vhosts/example.com/httpdocs/wp-content/plugins/elementor-pro/core/editor/editor.php::118] Using ${var} in strings is deprecated, use {$var} instead [array (
'trace' => '
#0: ElementorCoreLoggerManager -> shutdown()
',
)]
Logging into WordPress Admin Dashboard is working as expected using the native WordPress login functionality, e.g. https://example.com/wp-admin
Website is using PHP 8.x version

Elementor plugin bug.

Contact Elementor plugin Support to address this issue.

While the issue is not fixed by the vendor, here are some possible workarounds:

Switch the website to an older PHP version (e.g PHP 7.x)
Login to WordPress through the Subscriptions Screen (using the Active List rather than Dynamic List view