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-rw-r--r--lib/axlsx/workbook/worksheet/worksheet.rb3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/axlsx/workbook/worksheet/worksheet.rb b/lib/axlsx/workbook/worksheet/worksheet.rb
index 741e38b1..51613f75 100644
--- a/lib/axlsx/workbook/worksheet/worksheet.rb
+++ b/lib/axlsx/workbook/worksheet/worksheet.rb
@@ -541,7 +541,8 @@ module Axlsx
end
str.concat '</dataValidations>'
end
- str + '</worksheet>'
+ str.concat '</worksheet>'
+ str.tr("\u0000-\u001f\u007f\u0028", '')
end
# The worksheet relationships. This is managed automatically by the worksheet