From 7dbf88f221f278075d4ff9e153b21236d0826c33 Mon Sep 17 00:00:00 2001
From: xuri <xuri.me@gmail.com>
Date: Thu, 29 Jul 2021 00:03:57 +0800
Subject: This closes #971, closes #972 and closes #974 - Escape XML character
 in the drop list - Fix incorrect character count limit in the drop list - Fix
 Excel time parse issue in some case - Fix custom number format month parse
 issue in some case - Fix corrupted file generated caused by concurrency
 adding pictures

---
 sheet.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'sheet.go')

diff --git a/sheet.go b/sheet.go
index 7a1fff3..756eb81 100644
--- a/sheet.go
+++ b/sheet.go
@@ -72,12 +72,13 @@ func (f *File) contentTypesReader() *xlsxTypes {
 
 	if f.ContentTypes == nil {
 		f.ContentTypes = new(xlsxTypes)
+		f.ContentTypes.Lock()
+		defer f.ContentTypes.Unlock()
 		if err = f.xmlNewDecoder(bytes.NewReader(namespaceStrictToTransitional(f.readXML("[Content_Types].xml")))).
 			Decode(f.ContentTypes); err != nil && err != io.EOF {
 			log.Printf("xml decode error: %s", err)
 		}
 	}
-
 	return f.ContentTypes
 }
 
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