diff --git a/util/elffile.py b/util/elffile.py
index b368ed2..e08f343 100644
--- a/util/elffile.py
+++ b/util/elffile.py
@@ -63,7 +63,11 @@ def __getitem__(self, key):
         if isinstance(key, basestring):
             return self.byname[key]
         elif isinstance(key, int):
-            return self.bycode[key]
+            try:
+                return self.bycode[key]
+            except:
+                print('Unknow key', key)
+                return Code(self, '', 0, '')
         else:
             raise KeyError(key)