diff --git a/src/wp-admin/edit-form-blocks.php b/src/wp-admin/edit-form-blocks.php
index 74ec34c9f2..c81f40e5fd 100644
--- a/src/wp-admin/edit-form-blocks.php
+++ b/src/wp-admin/edit-form-blocks.php
@@ -197,11 +197,13 @@ if ( $editor_styles && current_theme_supports( 'editor-styles' ) ) {
 				);
 			}
 		} else {
-			$file     = get_theme_file_path( $style );
-			$styles[] = array(
-				'css'     => file_get_contents( get_theme_file_path( $style ) ),
-				'baseURL' => get_theme_file_uri( $style ),
-			);
+			$file = get_theme_file_path( $style );
+			if ( file_exists( $file ) ) {
+				$styles[] = array(
+					'css'     => file_get_contents( $file ),
+					'baseURL' => get_theme_file_uri( $style ),
+				);
+			}
 		}
 	}
 }