diff --git a/wp-admin/edit-form-blocks.php b/wp-admin/edit-form-blocks.php
index 373a6b3cc4..60f44edee9 100644
--- a/wp-admin/edit-form-blocks.php
+++ b/wp-admin/edit-form-blocks.php
@@ -192,7 +192,7 @@ if ( $editor_styles && current_theme_supports( 'editor-styles' ) ) {
 			}
 		} else {
 			$file = get_theme_file_path( $style );
-			if ( file_exists( $file ) ) {
+			if ( is_file( $file ) ) {
 				$styles[] = array(
 					'css'     => file_get_contents( $file ),
 					'baseURL' => get_theme_file_uri( $style ),
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 80f4b7e61b..f1a5086530 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-45618';
+$wp_version = '5.3-alpha-45619';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.