diff --git a/src/features/export/exportSlice.js b/src/features/export/exportSlice.js
index 90c11afe..50a81503 100644
--- a/src/features/export/exportSlice.js
+++ b/src/features/export/exportSlice.js
@@ -668,7 +668,7 @@ const _exportJson =
                   );
                 });
               }
-              return Object.assign(message, { content });
+              return Object.assign(message.getSafeCopy(), { content });
             })
           ),
         ],