From 7ea8f41efa35bcb7a6bcef1719835b2142166f27 Mon Sep 17 00:00:00 2001
From: Liu Ming <extrafliu@gmail.com>
Date: Mon, 12 Jun 2017 10:36:14 +0800
Subject: [PATCH] fix issue #20

---
 worksheet.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/worksheet.go b/worksheet.go
index 5a5717c..9bf065c 100644
--- a/worksheet.go
+++ b/worksheet.go
@@ -27,7 +27,9 @@ type WorkSheet struct {
 
 func (w *WorkSheet) Row(i int) *Row {
 	row := w.rows[uint16(i)]
-	row.wb = w.wb
+	if row != nil {
+		row.wb = w.wb
+	}
 	return row
 }