Invalid argument supplied for foreach() – wordpress-firewall.php on line 219

  • I know enough php to get into trouble. Unsure of the argument syntax that it’s expecting, so can’t start debugging.

    Upon deactivating, got:

    Warning: Cannot modify header information – headers already sent by (output started at /wp-content/plugins/wordpress-firewall.php:219) in /wp-includes/pluggable.php on line 865

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