diff --git a/ProcessMaker/ImportExport/Exporters/ExporterBase.php b/ProcessMaker/ImportExport/Exporters/ExporterBase.php
index 128ee2b5bf..bc6cfe5b3c 100644
--- a/ProcessMaker/ImportExport/Exporters/ExporterBase.php
+++ b/ProcessMaker/ImportExport/Exporters/ExporterBase.php
@@ -388,6 +388,9 @@ public function updateDuplicateAttributes()
                 }
                 $i++;
                 $value = $handler($value);
+                if ($value === null) {
+                    break;
+                }
             }
             $this->model->$attribute = $value;
         }