Ensure that _.transform checks that object is an object before using it as the accumulator [[Prototype]].

lodash.js

@@ -6945,9 +6945,10 @@
         if (isArr) {
           accumulator = [];
         } else {
-          var ctor = object && object.constructor,
-              proto = ctor && ctor.prototype;
-
+          if (isObject(object)) {
+            var ctor = object.constructor,
+                proto = ctor && ctor.prototype;
+          }
           accumulator = baseCreate(proto);
         }
       }

test/test.js

@@ -9404,6 +9404,10 @@
       ok(_.transform(new Foo) instanceof Foo);
     });
 
+    test('should check that `object` is an object before using it as the `accumulator` `[[Prototype]]', 1, function() {
+      ok(!(_.transform(1) instanceof Number));
+    });
+
     _.each({
       'array': [1, 2, 3],
       'object': { 'a': 1, 'b': 2, 'c': 3 }