From 3783d1d01b458a56a4de6aba4a2d10605bfbc876 Mon Sep 17 00:00:00 2001
From: xuri <xuri.me@gmail.com>
Date: Wed, 10 Feb 2021 00:04:13 +0800
Subject: [PATCH] This closes #782, fix unmerge all cells cause corrupted file

---
 merge.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/merge.go b/merge.go
index ec7815f..c50eaa3 100644
--- a/merge.go
+++ b/merge.go
@@ -148,6 +148,9 @@ func (f *File) UnmergeCell(sheet string, hcell, vcell string) error {
 	}
 	ws.MergeCells.Cells = ws.MergeCells.Cells[:i]
 	ws.MergeCells.Count = len(ws.MergeCells.Cells)
+	if ws.MergeCells.Count == 0 {
+		ws.MergeCells = nil
+	}
 	return nil
 }