ErrorException: Warning: Invalid argument supplied for foreach()
  File "/wp-content/plugins/planet4-plugin-gutenberg-blocks/classes/blocks/class-covers.php", line 302, in P4GBKS\Blocks\Covers::populate_posts_for_campaigns
    foreach ( $tags as $tag ) {
  File "/wp-content/plugins/planet4-plugin-gutenberg-blocks/classes/blocks/class-covers.php", line 116, in P4GBKS\Blocks\Covers::prepare_data
    $covers = $this->populate_posts_for_campaigns( $fields );
  File "/wp-content/plugins/planet4-plugin-gutenberg-blocks/classes/blocks/class-base-block.php", line 33, in P4GBKS\Blocks\Base_Block::render
    $data = $this->prepare_data( $attributes );
  File "/wp-includes/class-wp-block-type.php", line 109, in WP_Block_Type::render
    return (string) call_user_func( $this->render_callback, $attributes, $content );
  File "/wp-includes/blocks.php", line 487, in render_block
    $block_content = $block_type->render( $block['attrs'], $block_content );
...
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