diff --git a/src/Dev/Tasks/MigrateFileTask.php b/src/Dev/Tasks/MigrateFileTask.php
index 2d552be3b..c8a1c9fa3 100644
--- a/src/Dev/Tasks/MigrateFileTask.php
+++ b/src/Dev/Tasks/MigrateFileTask.php
@@ -104,8 +104,6 @@ class MigrateFileTask extends BuildTask
                 ImageThumbnailHelper::singleton()->run();
                 $this->extend('postFileMigrationSubtask', $subtask);
             }
-
-
         }
 
         $subtask = 'fix-folder-permissions';
@@ -145,6 +143,8 @@ class MigrateFileTask extends BuildTask
         }
 
         $this->extend('postFileMigration');
+
+        $this->logger->info("Done!");
     }
 
     public function getDescription()
diff --git a/src/Forms/FormField.php b/src/Forms/FormField.php
index c0920fa7b..94721475e 100644
--- a/src/Forms/FormField.php
+++ b/src/Forms/FormField.php
@@ -1621,9 +1621,11 @@ class FormField extends RequestHandler
      */
     public function getSchemaValidation()
     {
+        $validationList = [];
         if ($this->Required()) {
-            return [ 'required' => true ];
+            $validationList['required'] = true;
         }
-        return [];
+        $this->extend('updateSchemaValidation', $validationList);
+        return $validationList;
     }
 }
diff --git a/src/Forms/HeaderField.php b/src/Forms/HeaderField.php
index d350d41f5..52c260fb4 100644
--- a/src/Forms/HeaderField.php
+++ b/src/Forms/HeaderField.php
@@ -30,7 +30,7 @@ class HeaderField extends DatalessField
      * @param string $title
      * @param int $headingLevel
      */
-    public function __construct($name, $title, $headingLevel = 2)
+    public function __construct($name, $title = null, $headingLevel = 2)
     {
         $this->setHeadingLevel($headingLevel);
         parent::__construct($name, $title);
diff --git a/src/ORM/DataQuery.php b/src/ORM/DataQuery.php
index dd21d2bc2..2b4224be7 100644
--- a/src/ORM/DataQuery.php
+++ b/src/ORM/DataQuery.php
@@ -354,7 +354,6 @@ class DataQuery
     {
         if ($orderby = $query->getOrderBy()) {
             $newOrderby = array();
-            $i = 0;
             foreach ($orderby as $k => $dir) {
                 $newOrderby[$k] = $dir;
 
@@ -372,7 +371,6 @@ class DataQuery
                     if (isset($originalSelect[$col])) {
                         $query->selectField($originalSelect[$col], $col);
                     }
-
                     continue;
                 }
 
@@ -402,10 +400,15 @@ class DataQuery
                     if (!in_array($qualCol, $query->getSelect())) {
                         unset($newOrderby[$k]);
 
-                        $newOrderby["\"_SortColumn$i\""] = $dir;
-                        $query->selectField($qualCol, "_SortColumn$i");
+                        // Find the first free "_SortColumnX" slot
+                        // and assign it to $key
+                        $i = 0;
+                        while (isset($orderby[$key = "\"_SortColumn$i\""])) {
+                            ++$i;
+                        }
 
-                        $i++;
+                        $newOrderby[$key] = $dir;
+                        $query->selectField($qualCol, "_SortColumn$i");
                     }
                 }
             }
diff --git a/tests/php/ORM/DataQueryTest.php b/tests/php/ORM/DataQueryTest.php
index ef3a72c96..5a32508f0 100644
--- a/tests/php/ORM/DataQueryTest.php
+++ b/tests/php/ORM/DataQueryTest.php
@@ -296,6 +296,32 @@ class DataQueryTest extends SapphireTest
         static::resetDBSchema(true);
     }
 
+    public function testSurrogateFieldSort()
+    {
+        $query = new DataQuery(DataQueryTest\ObjectE::class);
+        $query->sort(
+            sprintf(
+                '(case when "Title" = %s then 1 else 0 end)',
+                DB::get_conn()->quoteString('Second')
+            ),
+            'DESC',
+            true
+        );
+        $query->sort('SortOrder', 'ASC', false);
+        $query->sort(
+            sprintf(
+                '(case when "Title" = %s then 0 else 1 end)',
+                DB::get_conn()->quoteString('Fourth')
+            ),
+            'DESC',
+            false
+        );
+        $this->assertEquals(
+            $query->execute()->column('Title'),
+            $query->column('Title')
+        );
+    }
+
     public function testComparisonClauseDateStartsWith()
     {
         DB::query("INSERT INTO \"DataQueryTest_F\" (\"MyDate\") VALUES ('1988-03-04 06:30')");
diff --git a/tests/php/ORM/SQLSelectTest.php b/tests/php/ORM/SQLSelectTest.php
index 7b36fa335..a97792cfc 100755
--- a/tests/php/ORM/SQLSelectTest.php
+++ b/tests/php/ORM/SQLSelectTest.php
@@ -854,7 +854,7 @@ class SQLSelectTest extends SapphireTest
         $sql = $query->sql();
 
         $this->assertSQLEquals(
-            'SELECT * FROM "MyTable" AS "MyTableAlias" , '.
+            'SELECT * FROM "MyTable" AS "MyTableAlias" , ' .
             '(SELECT * FROM "MyTable" where "something" = "whatever") as "CrossJoin"',
             $sql
         );