diff --git a/index.js b/index.js
index ce8621d..d448582 100644
--- a/index.js
+++ b/index.js
@@ -37,7 +37,7 @@ function onIncomingMessage(params) {
             from: partner,
             from_raw: params.from_raw,
             msg: msg,
-            do_not_forward_to_core: params.do_not_forward_to_core,
+            do_not_forward_to_core: params.do_not_forward_to_core || null,
         }
     }