https://github.com/Volicon/NestedLink/issues/8

Author: Vlad Balin

valuelink.js

@@ -247,15 +247,18 @@ interface Helper {
     remove( obj : any, key : string | number ) : any
 }
 
+const ArrayProto = Array.prototype,
+      ObjectProto = Object.prototype;
+
 function helpers( value ) : Helper {
-    switch( value && Object.getPrototypeOf( value ) ){
-        case Array.prototype :
-            return arrayHelpers;
-        case Object.prototype :
-            return objectHelpers;
-        default:
-            return dummyHelpers;
+    if( value && typeof value === 'object' ){
+        switch( Object.getPrototypeOf( value ) ){
+            case ArrayProto  : return arrayHelpers;
+            case ObjectProto : return objectHelpers;
+        }
     }
+
+    return dummyHelpers;
 }
 
 // Do nothing for types other than Array and plain Object.