diff --git a/wp-includes/Text/Diff.php b/wp-includes/Text/Diff.php
index eee4e4f8ea..b3c63afc5f 100644
--- a/wp-includes/Text/Diff.php
+++ b/wp-includes/Text/Diff.php
@@ -276,7 +276,7 @@ class Text_Diff {
 
         $prevtype = null;
         foreach ($this->_edits as $edit) {
-            if ($edit instanceof $prevtype) {
+            if ($prevtype !== null && $edit instanceof $prevtype) {
                 trigger_error("Edit sequence is non-optimal", E_USER_ERROR);
             }
             $prevtype = get_class($edit);
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 6a9c543157..114c76a8d8 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.7-alpha-59069';
+$wp_version = '6.7-alpha-59070';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.