Check if wc_admin_get_core_pages_to_connect() exists before usage. Pa…

…rse default props needed for label creation to not throw any errors.

src/Admin/Admin.php

@@ -211,6 +211,10 @@ public static function register_admin_connected_pages( $is_connected, $current_p
 	}
 
 	public static function register_admin_breadcrumbs( $breadcrumbs, $current_page ) {
+		if ( ! function_exists( 'wc_admin_get_core_pages_to_connect' ) ) {
+			return $breadcrumbs;
+		}
+
 		if ( false === $current_page ) {
 			$screen = get_current_screen();
 

src/Rest/ShipmentsController.php

@@ -1048,7 +1048,7 @@ public function create_label( $request ) {
 		$args                 = array();
 		$args['product_id']   = wc_clean( wp_unslash( $request['product_id'] ) );
 		$args['print_format'] = wc_clean( wp_unslash( $request['print_format'] ) );
-		$args['services']     = wc_clean( wp_unslash( $request['services'] ) );
+		$args['services']     = (array) wc_clean( wp_unslash( $request['services'] ) );
 
 		if ( isset( $request['meta_data'] ) && is_array( $request['meta_data'] ) ) {
 			foreach ( $request['meta_data'] as $meta ) {

src/ShippingProvider/Auto.php

@@ -743,6 +743,12 @@ public function create_label( $shipment, $props = false ) {
 			$props      = array_merge( $props, $dimensions );
 		}
 
+		$props = wp_parse_args( $props, array(
+			'services'     => array(),
+			'print_format' => '',
+			'product_id'   => '',
+		) );
+
 		/**
 		 * Neither allow invalid service configuration from automatic nor manual requests.
 		 */