Issue #18559: Fix NULL pointer dereference error in _pickle module

diff --cc Misc/NEWS
index 1dff486842a67ba45842903521a58f8cfd65bb31,24b0c53f6cd0bcd058c6c83374e4c7dd03497ea3..2f387e7475a6aa1b4d806fd89124c0b0570f996e
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -166,10 -52,10 +166,12 @@@ Core and Builtin
  Library
  -------
  
 -- Issue #18556: Check the return value of a PyUnicode_AsWideChar() call in
 -  ctypes' U_set().
+ - Issue #18559: Fix NULL pointer dereference error in _pickle module
+ 
 +- Issue #18556: Check the return type of PyUnicode_AsWideChar() in ctype's
 +  U_set().
 +
 +- Issue #17818: aifc.getparams now returns a namedtuple.
  
  - Issue #18549: Eliminate dead code in socket_ntohl()
  

diff --cc Modules/_pickle.c
Simple merge