Merge branch 'pr/19'

Author: eriwen

spec/stackframe-spec.js

@@ -13,6 +13,17 @@ describe('StackFrame', function() {
             };
             expect(fn).toThrow();
         });
+
+        it('works with objects with null prototype', function() {
+            var obj = Object.create(null);
+            obj.fileName = 'foo.js';
+            obj.functionName = 'foo';
+            obj.lineNumber = 1;
+            obj.columnNumber = 42
+            var sf = new StackFrame(obj);
+            
+            expect(sf.fileName).toEqual('foo.js');
+        });
     });
 
     describe('#setFunctionName', function() {

stackframe.js

@@ -34,11 +34,10 @@
     var props = booleanProps.concat(numericProps, stringProps, arrayProps);
 
     function StackFrame(obj) {
-        if (obj instanceof Object) {
-            for (var i = 0; i < props.length; i++) {
-                if (obj.hasOwnProperty(props[i]) && obj[props[i]] !== undefined) {
-                    this['set' + _capitalize(props[i])](obj[props[i]]);
-                }
+        if (!obj) return;
+        for (var i = 0; i < props.length; i++) {
+            if (obj[props[i]] !== undefined) {
+                this['set' + _capitalize(props[i])](obj[props[i]]);
             }
         }
     }