diff -up mutt-1.5.21/crypt-gpgme.c.notation mutt-1.5.21/crypt-gpgme.c

--- mutt-1.5.21/crypt-gpgme.c.notation	2012-04-25 10:26:20.589226791 +0200

+++ mutt-1.5.21/crypt-gpgme.c	2012-04-25 10:28:02.075915855 +0200

@@ -72,7 +72,8 @@

 #define xtoi_2(p)   ((xtoi_1(p) * 16) + xtoi_1((p)+1))

 #define PKA_NOTATION_NAME "pka-address@gnupg.org"

-#define is_pka_notation(notation) (! strcmp ((notation)->name, \

+#define is_pka_notation(notation) ((notation)->name && \ 

+                                   ! strcmp ((notation)->name, \ 

 					     PKA_NOTATION_NAME))

 /* Values used for comparing addresses. */