diff -up sudo-1.8.6p7/src/sudo.c.null_exception sudo-1.8.6p7/src/sudo.c
--- sudo-1.8.6p7/src/sudo.c.null_exception	2016-05-11 10:39:56.466888652 +0200
+++ sudo-1.8.6p7/src/sudo.c	2016-05-11 10:39:56.530887742 +0200
@@ -483,6 +483,9 @@ get_user_info(struct user_details *ud)
 	    errorx(1, _("unable to allocate memory"));
 	ud->cwd = user_info[i] + sizeof("cwd=") - 1;
     }
+    else {
+	errorx(1, _("unable to resolve current working directory"));
+    }
 
     if ((cp = get_process_ttyname()) != NULL) {
 	user_info[++i] = fmt_string("tty", cp);