2 files changed, 14 insertions, 3 deletions
diff --git a/lib/axlsx/workbook/worksheet/worksheet.rb b/lib/axlsx/workbook/worksheet/worksheet.rb
index 26385573..5f650263 100644
--- a/lib/axlsx/workbook/worksheet/worksheet.rb
+++ b/lib/axlsx/workbook/worksheet/worksheet.rb
@@ -23,11 +23,11 @@ module Axlsx
     # @option options [Boolean] show_gridlines indicates if gridlines should be shown for this sheet.
     def initialize(wb, options={})
       self.workbook = wb
-      @workbook.worksheets << self
       @sheet_protection = nil
 
       initialize_page_options(options)
       parse_options options
+      @workbook.worksheets << self
     end
 
     # Initalizes page margin, setup and print options
@@ -637,14 +637,14 @@ module Axlsx
         end
         sheet_view.show_outline_symbols = true
       end
-
     end
+
     def validate_sheet_name(name)
       DataTypeValidator.validate "Worksheet.name", String, name
       raise ArgumentError, (ERR_SHEET_NAME_TOO_LONG % name) if name.size > 31
       raise ArgumentError, (ERR_SHEET_NAME_CHARACTER_FORBIDDEN % name) if '[]*/\?:'.chars.any? { |char| name.include? char }
       name = Axlsx::coder.encode(name)
-      sheet_names = @workbook.worksheets.map { |s| s.name }
+      sheet_names = @workbook.worksheets.reject { |s| s == self }.map { |s| s.name }
       raise ArgumentError, (ERR_DUPLICATE_SHEET_NAME % name) if sheet_names.include?(name)
     end
 
diff --git a/test/workbook/worksheet/tc_worksheet.rb b/test/workbook/worksheet/tc_worksheet.rb
index 8280aca0..ed8c7cab 100644
--- a/test/workbook/worksheet/tc_worksheet.rb
+++ b/test/workbook/worksheet/tc_worksheet.rb
@@ -405,6 +405,11 @@ class TestWorksheet < Test::Unit::TestCase
     assert_raise(ArgumentError, "worksheet name must be unique") { n = @ws.name; @ws.workbook.add_worksheet(:name=> n) }
   end
 
+  def test_name_unique_only_checks_other_worksheet_names
+    assert_nothing_raised { @ws.name = @ws.name }
+    assert_nothing_raised { Axlsx::Package.new.workbook.add_worksheet :name => 'Sheet1' }
+  end
+
   def test_name_size
     assert_raise(ArgumentError, "name too long!") { @ws.name = Array.new(32, "A").join() }
     assert_nothing_raised { @ws.name = Array.new(31, "A").join() }
@@ -492,4 +497,10 @@ class TestWorksheet < Test::Unit::TestCase
     assert_equal(true, @ws.sheet_view.show_outline_symbols)
   end
 
+  def test_worksheet_does_not_get_added_to_workbook_on_initialize_failure
+    assert_equal(1, @wb.worksheets.size)
+    assert_raise(ArgumentError) { @wb.add_worksheet(:name => 'Sheet1') }
+    assert_equal(1, @wb.worksheets.size)
+  end
+
 end