make sure to use ToLocal rather than ToLocalChecked

context.go

@@ -169,7 +169,10 @@ func valueResult(ctx *Context, rtn C.RtnValue) (*Value, error) {
 	return &Value{rtn.value, ctx}, nil
 }
 
-func valueStrings(ctx *Context, rtn C.RtnStrings) []string {
+func valueStrings(ctx *Context, rtn C.RtnStrings) ([]string, error) {
+	if rtn.strings == nil {
+		return []string{}, newJSError(rtn.error)
+	}
 	length := rtn.length
 	slice := (*[1 << 28]*C.char)(unsafe.Pointer(rtn.strings))[:length:length]
 	var result []string
@@ -179,7 +182,7 @@ func valueStrings(ctx *Context, rtn C.RtnStrings) []string {
 		result = append(result, C.GoString(s))
 	}
 	defer C.free(unsafe.Pointer(rtn.strings))
-	return result
+	return result, nil
 }
 
 func objectResult(ctx *Context, rtn C.RtnValue) (*Object, error) {

object.go

@@ -86,7 +86,7 @@ func (o *Object) SetIdx(idx uint32, val interface{}) error {
 
 // Returns an array containing the names of the enumerable properties of this object,
 // including properties from prototype objects
-func (o *Object) GetEnumerablePropertyNames() []string {
+func (o *Object) GetEnumerablePropertyNames() ([]string, error) {
 	rtn := C.ObjectGetPropertyNames(o.ptr)
 	return valueStrings(o.ctx, rtn)
 }

object_test.go

@@ -204,7 +204,8 @@ func TestGetEnumerablePropertyNames(t *testing.T) {
 	obj.Set("hello", "world")
 
 	expectedProperties := []string{"bar2", "foo", "hello"}
-	properties := obj.GetEnumerablePropertyNames()
+	properties, err := obj.GetEnumerablePropertyNames()
+	fatalIf(t, err)
 
 	if !reflect.DeepEqual(properties, expectedProperties) {
 		t.Error("properteis are not the same")

v8go.cc

@@ -1294,14 +1294,21 @@ RtnStrings ObjectGetPropertyNames(ValuePtr ptr) {
   LOCAL_OBJECT(ptr);
   RtnStrings rtn = {};
 
-  MaybeLocal<Array> maybe_names = obj->GetPropertyNames(local_ctx);
-  Local<Array> names = maybe_names.ToLocalChecked();
+  Local<Array> names;
+  if (!obj->GetPropertyNames(local_ctx).ToLocal(&names)) {
+    rtn.error = ExceptionError(try_catch, iso, local_ctx);
+    return rtn;
+  }
 
   uint32_t length = names->Length();
   const char** strings = new const char*[length];
 
   for (uint32_t i = 0; i < length; i++) {
-    Local<Value> name_from_array = names->Get(local_ctx, i).ToLocalChecked();
+    Local<Value> name_from_array;
+    if (!names->Get(local_ctx, i).ToLocal(&name_from_array)) {
+      rtn.error = ExceptionError(try_catch, iso, local_ctx);
+      return rtn;
+    }
     String::Utf8Value ds(iso, name_from_array);
     strings[i] = CopyString(ds);
   }