From df36d84f1b43cdb9c5aba2277942871d874deecf Mon Sep 17 00:00:00 2001
From: Olly Betts <olly@survex.com>
Date: Thu, 26 Feb 2015 14:59:49 +1300
Subject: [PATCH] Avoid debug code segfaults when top==NULL

---
 Source/Modules/main.cxx | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Source/Modules/main.cxx b/Source/Modules/main.cxx
index aa0d7d589..f0f9962dd 100644
--- a/Source/Modules/main.cxx
+++ b/Source/Modules/main.cxx
@@ -1221,7 +1221,7 @@ int SWIG_main(int argc, char *argv[], Language *l) {
       Printf(stdout, "debug-top stage 3\n");
       Swig_print_tree(top);
     }
-    if (dump_module & STAGE3) {
+    if (top && (dump_module & STAGE3)) {
       Printf(stdout, "debug-module stage 3\n");
       Swig_print_tree(Getattr(top, "module"));
     }
@@ -1230,7 +1230,7 @@ int SWIG_main(int argc, char *argv[], Language *l) {
       Printf(stdout, "Generating wrappers...\n");
     }
 
-    if (dump_classes) {
+    if (top && dump_classes) {
       Hash *classes = Getattr(top, "classes");
       if (classes) {
 	Printf(stdout, "Classes\n");