diff --git a/main.py b/main.py
index d642df7..24ea1ef 100644
--- a/main.py
+++ b/main.py
@@ -301,7 +301,9 @@ class Bear():
             for index in range(0, entry['number_of_elements']):
                 kid = flat_entry.copy()
                 kid['name'] = '{name}[{index}]'.format(name=flat_entry['name'], index=index)
-                kid['address'] = hex(int(flat_entry['address'], 16) + entry['size_byte'] * index)
+
+                if ('address' in flat_entry) and ('size_byte' in entry):
+                    kid['address'] = hex(int(flat_entry['address'], 16) + entry['size_byte'] * index)
 
                 self.pettanko(kid)