From 6e456250f7ceb5a89da60223ae16ce6cbe563398 Mon Sep 17 00:00:00 2001
From: Teppei Fukuda <teppei@elab.ic.i.u-tokyo.ac.jp>
Date: Mon, 4 Sep 2017 22:25:57 +0800
Subject: [PATCH] Erros skip nil in Add function (#1566)

---
 errors.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/errors.go b/errors.go
index 832fa9b0..6845188e 100644
--- a/errors.go
+++ b/errors.go
@@ -29,6 +29,10 @@ func (errs Errors) GetErrors() []error {
 // Add adds an error
 func (errs Errors) Add(newErrors ...error) Errors {
 	for _, err := range newErrors {
+		if err == nil {
+			continue
+		}
+
 		if errors, ok := err.(Errors); ok {
 			errs = errs.Add(errors...)
 		} else {