diff --git a/files/converter/unoconv/classes/converter.php b/files/converter/unoconv/classes/converter.php
index bbcedf0e73b..cb20f607b2d 100644
--- a/files/converter/unoconv/classes/converter.php
+++ b/files/converter/unoconv/classes/converter.php
@@ -194,7 +194,9 @@ class converter implements \core_files\converter_interface {
 
         $conversions = conversion::get_conversions_for_file($testdocx, $format);
         foreach ($conversions as $conversion) {
-            $conversion->delete();
+            if ($conversion->get('id')) {
+                $conversion->delete();
+            }
         }
 
         $conversion = new conversion(0, (object) [