Cannot Unset String Offsets Error when Migrating

Hi, I’ve got an unusual error when trying to migrating my WordPress site from Bluehost to DigitalOcean. I’ve extracted the root WordPress folder to var/www/html/mydomain, set the Apache virtual host, imported database and adjusted the value in wp-config.php. I haven’t change anything except changing the domain value in wp_options from https:// to http:// (because I plan to disable http temporarily and create a new certificate after migration success)

When trying to access any page, including wp-admin dashboard, I got the following error which returns 500 response code.

[php7:error] [pid 8715] [client 52.77.206.243:60722] PHP Fatal error: Uncaught Error: Cannot unset string offsets in /var/www/html/mydomain/wp-includes/widgets.php:1142\nStack trace:\n#0 /var/www/html/mydomain/wp-includes/widgets.php(1115): retrieve_widgets(true)\n#1 /var/www/html/mydomain/wp-includes/class-wp-hook.php(288): _wp_sidebars_changed('http://www.mydo...')\n#2 /var/www/html/mydomain/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array)\n#3 /var/www/html/mydomain/wp-includes/plugin.php(453): WP_Hook->do_action(Array)\n#4 /var/www/html/mydomain/wp-includes/theme.php(2752): do_action('after_switch_th...', 'http://www.mydo...', Object(WP_Theme))\n#5 /var/www/html/mydomain/wp-includes/class-wp-hook.php(286): check_theme_switched('')\n#6 /var/www/html/mydomain/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array)\n#7 /var/www/html/mydomain/wp-includes/plugin.php(453): WP_Hook->do_action(Array)\n#8 /var/www/html/mydomain/wp-settings.php(450): do_action('init')\n#9 /var/www/html/mydomain/wp-confi in /var/www/html/mydomain/wp-includes/widgets.php on line 1142

The PHP version is PHP 7.2.10-0ubuntu0.18.04.1. WordPress version is 4.9.9
What should I do to fix it?

• This topic was modified 7 years, 2 months ago by ivanchibi.