diff --git a/src/debuggability.js b/src/debuggability.js
index cdee9d15b..d0df62bcd 100644
--- a/src/debuggability.js
+++ b/src/debuggability.js
@@ -400,6 +400,8 @@ function checkForgottenReturns(returnValue, promiseCreated, name, promise,
     if (returnValue === undefined && promiseCreated !== null &&
         wForgottenReturn) {
         if (parent !== undefined && parent._returnedNonUndefined()) return;
+        var bitField = promise._bitField;
+        if (BIT_FIELD_READ(LENGTH_MASK) === 0) return;
 
         if (name) name = name + " ";
         var msg = "a promise was created in a " + name +