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-rw-r--r--ext/tk/lib/tk.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/tk/lib/tk.rb b/ext/tk/lib/tk.rb
index c6c0e799d7..6ee5c36fba 100644
--- a/ext/tk/lib/tk.rb
+++ b/ext/tk/lib/tk.rb
@@ -3359,7 +3359,7 @@ class TkObject<TkKernel
private :tk_trace_variable
def destroy
- tk_call 'trace', 'vdelete', @tk_vn, 'w', @var_id if @var_id
+ tk_call 'trace', 'vdelete', @tk_vn, 'w', @var_id if defined? @var_id
end
end