diff --git a/wp-includes/blocks.php b/wp-includes/blocks.php
index b99c15b138..6e4924cd4d 100644
--- a/wp-includes/blocks.php
+++ b/wp-includes/blocks.php
@@ -184,10 +184,13 @@ function render_block( $block ) {
 		$block_content .= is_string( $chunk ) ? $chunk : render_block( $block['innerBlocks'][ $index++ ] );
 	}
 
+	if ( ! is_array( $block['attrs'] ) ) {
+		$block['attrs'] = array();
+	}
+
 	if ( $is_dynamic ) {
-		$attributes    = is_array( $block['attrs'] ) ? (array) $block['attrs'] : array();
 		$global_post   = $post;
-		$block_content = $block_type->render( $attributes, $block_content );
+		$block_content = $block_type->render( $block['attrs'], $block_content );
 		$post          = $global_post;
 	}
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index ad143b78dd..6bff2d754e 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-beta3-43887';
+$wp_version = '5.0-beta3-43888';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.