From 4089b50080bd9ad2b769d3c42a610abe519c16c8 Mon Sep 17 00:00:00 2001
From: Serhiy Storchaka <storchaka@gmail.com>
Date: Fri, 28 Oct 2016 12:14:34 +0300
Subject: Fixed possible NULL decrefing.

---
 Modules/_tkinter.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Modules/_tkinter.c b/Modules/_tkinter.c
index 2a652b0..46cc64d 100644
--- a/Modules/_tkinter.c
+++ b/Modules/_tkinter.c
@@ -1874,7 +1874,7 @@ var_perform(VarEvent *ev)
         PyErr_NormalizeException(&exc, &val, &tb);
         *(ev->exc_type) = exc;
         *(ev->exc_val) = val;
-        Py_DECREF(tb);
+        Py_XDECREF(tb);
     }
 
 }
-- 
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