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-rw-r--r--ext/tk/lib/tkdialog.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/lib/tkdialog.rb b/ext/tk/lib/tkdialog.rb
index 2c280d5618..b15b79421b 100644
--- a/ext/tk/lib/tkdialog.rb
+++ b/ext/tk/lib/tkdialog.rb
@@ -74,6 +74,7 @@ class TkDialog2 < TkWindow
@title = keys['title'] if keys.key? 'title'
@message = keys['message'] if keys.key? 'message'
@bitmap = keys['bitmap'] if keys.key? 'bitmap'
+ @bitmap = '{}' if @bitmap == nil || @bitmap == ""
@default_button = keys['default'] if keys.key? 'default'
@buttons = keys['buttons'] if keys.key? 'buttons'