5.3 compatibility

Post upgrade to wp 5.3 i’m seeing the following warnings:

Warning:: ftp_nlist() expects parameter 1 to be resource, null given in /wp-admin/includes/class-wp-filesystem-ftpext.php on line 402
Warning: ftp_pwd() expects parameter 1 to be resource, null given in /wp-admin/includes/class-wp-filesystem-ftpext.php on line 226
Warning: ftp_pwd() expects parameter 1 to be resource, null given in /wp-admin/includes/class-wp-filesystem-ftpext.php on line 226
Warning: ftp_pwd() expects parameter 1 to be resource, null given in /wp-admin/includes/class-wp-filesystem-ftpext.php on line 681

I caught the warning and printed a stacktrace which shows the following:

‘file’ => ‘/wp-admin/includes/class-wp-filesystem-ftpext.php’,
‘line’ => 423,
‘file’ => ‘/wp-admin/includes/class-wp-filesystem-ftpext.php’,
‘line’ => 677,
‘file’ => ‘/wp-content/plugins/memory-core/libs/admin/reduxframework/ReduxCore/inc/extensions/wbc_importer/extension_wbc_importer.php’,
‘line’ => 106,
‘file’ => ‘/wp-content/plugins/memory-core/libs/admin/reduxframework/ReduxCore/inc/extensions/wbc_importer/extension_wbc_importer.php’,
‘line’ => 148,
‘file’ => ‘/wp-content/plugins/memory-core/libs/admin/reduxframework/ReduxCore/inc/extensions/wbc_importer/extension_wbc_importer.php’,
‘line’ => 71,
‘file’ => ‘/wp-content/plugins/memory-core/libs/admin/reduxframework/ReduxCore/framework.php’,
‘line’ => 2447,
‘file’ => ‘/wp-content/plugins/memory-core/libs/admin/reduxframework/ReduxCore/framework.php’,
‘line’ => 334,
‘file’ => ‘/wp-content/themes/memory/core/theme_options.php’,
‘line’ => 55,
‘file’ => ‘/wp-content/themes/memory/core/theme_options.php’,
‘line’ => 21,
‘file’ => ‘/wp-content/themes/memory/core/theme_options.php’,
‘line’ => 1268,
‘file’ => ‘/wp-content/themes/memory/core/init.php’,
‘line’ => 6,
‘file’ => ‘/wp-content/themes/memory/functions.php’,
‘line’ => 5,
‘file’ => ‘/wp-settings.php’,
‘line’ => 497,
‘file’ => ‘/wp-config.php’,
‘line’ => 78,
‘file’ => ‘/wp-load.php’,
‘line’ => 37,
‘file’ => ‘/wp-admin/admin-ajax.php’,
‘line’ => 22,

Suggesting it’s a problem with Memory theme.

From what I understand previously these warnings were suppressed by wordpress but this was removed recently.