Attempt to read property “ID“ on null“ at `./wp-content/plugins/avatar-manager/avatar-manager.php:1144

[JanThiel]

Triggered by:

avatar-manager/avatar-manager.php

Lines 1140 to 1147 in eb638b0

	function avatar_manager_display_media_states( $media_states ) {
	global $post;
	// Retrieves attachment meta field based on attachment ID.
	$meta_avatar = get_post_meta( $post->ID, '_avatar_manager_is_custom_avatar', true );
	if ( ! empty( $meta_avatar ) )
	$media_states[] = __( 'Avatar Image', 'avatar-manager' );

But since WP 4.8.0 display_media_states passes the relevant $post as parameter.

	/**
	 * Filters the default media display states for items in the Media list table.
	 *
	 * @since 3.2.0
	 * @since 4.8.0 Added the `$post` parameter.
	 *
	 * @param string[] $media_states An array of media states. Default 'Header Image',
	 *                               'Background Image', 'Site Icon', 'Logo'.
	 * @param WP_Post  $post         The current attachment object.
	 */
	return apply_filters( 'display_media_states', $media_states, $post );

No need to fallback to the global. Just take the passed WP_Post and work on that