diff -r d9d876e97a66 -r ad12a83e4acd tools/Vtable scanner/main.cpp
--- a/tools/Vtable scanner/main.cpp	Tue Jul 01 09:48:17 2008 +0000
+++ b/tools/Vtable scanner/main.cpp	Tue Jul 01 23:42:19 2008 +0000
@@ -38,6 +38,11 @@
 
 	pVtable = (void **)dlsym(handle, argv[2]);
 
+	if (pVtable == NULL)
+	{
+		printf("Invalid vtable symbol \"%s\"\n", argv[2]);
+	}
+
 	if (argc >= 5)
 	{
 		params = argv[4];