diff --git a/lib/testing/classes/util.php b/lib/testing/classes/util.php
index 1b08d6ff86a..e0b8c3a796c 100644
--- a/lib/testing/classes/util.php
+++ b/lib/testing/classes/util.php
@@ -638,7 +638,11 @@ abstract class testing_util {
 
         foreach ($data as $table => $records) {
             if ($borkedmysql) {
-                if (empty($records) and isset($empties[$table])) {
+                if (empty($records)) {
+                    if (!isset($empties[$table])) {
+                        // Table has been modified and is not empty.
+                        $DB->delete_records($table, null);
+                    }
                     continue;
                 }
 
@@ -660,9 +664,8 @@ abstract class testing_util {
             }
 
             if (empty($records)) {
-                if (isset($empties[$table])) {
-                    // table was not modified and is empty
-                } else {
+                if (!isset($empties[$table])) {
+                    // Table has been modified and is not empty.
                     $DB->delete_records($table, array());
                 }
                 continue;