PHP Fatal error on Customizer or Widgets page: “Uncaught InvalidArgumentException: item should be a Collection or an array or an object in /sitepress-multilingual-cms/vendor/wpml/fp/core/Obj.php:97”

Status: Resolved
Reported for: WPML Multilingual CMS 4.4.6
Resolved in: WPML 4.4.8

Overview of the issue

If you go to the Customizer or Widgets page in your site’s admin, a blank page or fatal error is shown:

PHP Fatal error: Uncaught InvalidArgumentException: item should be a Collection or an array or an object in .../wp-content/plugins/sitepress-multilingual-cms/vendor/wpml/fp/core/Obj.php:97

Workaround

Make a full backup of your site before proceeding.

Open the file /wp-content/plugins/sitepress-multilingual-cms/classes/widgets/class-wpml-widgets-support-backend.php.

Change:

			'selected_language' => Obj::propOr( 'all', 'wpml_language', $instance ),

To:

			'selected_language' => Obj::propOr( 'all', 'wpml_language', is_array( $instance ) ? $instance : [] ),

Edit your Customizer options and/or widgets.

When done editing, remove the code added in step 2.
Open the file: wp-content/plugins/sitepress-multilingual-cms/sitepress.class.php

Change:

		$post_types = get_post_types( $args, 'objects' );

		foreach ( $post_types as $name => $attrs ) {
			$slug = trim( Obj::pathOr( '', [ 'rewrite', 'slug' ], $attrs ), '/' );
			if ( $slug && isset( $vars[ $slug ] ) ) {
				$post_type = $name;
				$post_slug = $vars[ $slug ];
				break;
			}
		}

To:

		$post_types = get_post_types( $args, 'objects' );

		foreach ( $post_types as $name => $attrs ) {
		    if ( $attrs->rewrite == false ) {
		        break;
		    }
			$slug = trim( Obj::pathOr( '', [ 'rewrite', 'slug' ], $attrs ), '/' );
			if ( $slug && isset( $vars[ $slug ] ) ) {
				$post_type = $name;
				$post_slug = $vars[ $slug ];
				break;
			}
		}

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