diff -up bash-4.1/variables.c.Ai bash-4.1/variables.c
--- bash-4.1/variables.c.Ai	2010-07-28 08:42:54.000000000 +0200
+++ bash-4.1/variables.c	2010-07-28 08:43:17.000000000 +0200
@@ -2371,7 +2371,7 @@ bind_int_variable (lhs, rhs)
 #endif
     v = bind_variable (lhs, rhs, 0);
 
-  if (isint)
+  if (isint && v)
     VSETATTR (v, att_integer);
 
   return (v);