diff --git a/core/model/DataDifferencer.php b/core/model/DataDifferencer.php
index 96c852cfd..2d87670e9 100644
--- a/core/model/DataDifferencer.php
+++ b/core/model/DataDifferencer.php
@@ -113,8 +113,8 @@ class DataDifferencer extends ViewableData {
 					'Diff' => $this->fromRecord
 						? Diff::compareHTML($this->fromRecord->$field, $this->toRecord->$field)
 						: "<ins>" . $this->toRecord->$field . "</ins>",
-					'From' => $this->fromRecord->$field,
-					'To' => $this->toRecord->$field,
+					'From' => $this->fromRecord ? $this->fromRecord->$field : null,
+					'To' => $this->toRecord ? $this->toRecord->$field : null,
 				)));
 			}
 		}