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-rw-r--r--lib/redmine/export/pdf.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/redmine/export/pdf.rb b/lib/redmine/export/pdf.rb
index 0000ddeba..3a246cfc2 100644
--- a/lib/redmine/export/pdf.rb
+++ b/lib/redmine/export/pdf.rb
@@ -428,7 +428,7 @@ module Redmine
if query.grouped? &&
(group = query.group_by_column.value(issue)) != previous_group
pdf.SetFontStyle('B',10)
- group_label = group.blank? ? 'None' : group.to_s
+ group_label = group.blank? ? 'None' : group.to_s.dup
group_label << " (#{query.issue_count_by_group[group]})"
pdf.Bookmark group_label, 0, -1
pdf.RDMCell(table_width + col_id_width, row_height * 2, group_label, 1, 1, 'L')