diff --git a/lodash.src.js b/lodash.src.js
index eb5d9ba40..bd7e17321 100644
--- a/lodash.src.js
+++ b/lodash.src.js
@@ -2537,6 +2537,9 @@
             ? toPlainObject(value)
             : (isPlainObject(value) ? value : {});
         }
+        else {
+          isCommon = false;
+        }
       }
       // Add the source value to the stack of traversed objects and associate
       // it with its merged value.