diff --git a/src/parser/content-parser.php b/src/parser/content-parser.php
index 3ee1211..c5c4e94 100644
--- a/src/parser/content-parser.php
+++ b/src/parser/content-parser.php
@@ -297,7 +297,11 @@ protected function source_block( WP_Block $block, array $filter_options ) {
 		];
 
 		// WP_Block#inner_blocks can be an array or WP_Block_List (iterable).
-		$inner_blocks = iterator_to_array( $block->inner_blocks );
+		if ( is_array( $block->inner_blocks ) ) {
+			$inner_blocks = $block->inner_blocks;
+		} else {
+			$inner_blocks = iterator_to_array( $block->inner_blocks );
+		}
 
 		/**
 		 * Filters a block's inner blocks before recursive iteration.
diff --git a/vip-block-data-api.php b/vip-block-data-api.php
index 0ddb80d..5874815 100644
--- a/vip-block-data-api.php
+++ b/vip-block-data-api.php
@@ -5,7 +5,7 @@
  * Description: Access Gutenberg block data in JSON via the REST API.
  * Author: WordPress VIP
  * Text Domain: vip-block-data-api
- * Version: 1.4.0
+ * Version: 1.4.1
  * Requires at least: 6.0
  * Tested up to: 6.6
  * Requires PHP: 8.0
@@ -20,7 +20,7 @@
 if ( ! defined( 'VIP_BLOCK_DATA_API_LOADED' ) ) {
 	define( 'VIP_BLOCK_DATA_API_LOADED', true );
 
-	define( 'WPCOMVIP__BLOCK_DATA_API__PLUGIN_VERSION', '1.4.0' );
+	define( 'WPCOMVIP__BLOCK_DATA_API__PLUGIN_VERSION', '1.4.1' );
 	define( 'WPCOMVIP__BLOCK_DATA_API__REST_ROUTE', 'vip-block-data-api/v1' );
 
 	// Analytics related configs.