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-rw-r--r--src-py/model/graph.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/src-py/model/graph.py b/src-py/model/graph.py
index ebe8b31e..efc403d4 100644
--- a/src-py/model/graph.py
+++ b/src-py/model/graph.py
@@ -46,6 +46,7 @@ class Attr_Diff(dict):
def add_node_attr_write(self, n_id, attr_name, attr_val):
+ assert 'id' != attr_name.lower(), 'Attr_Diff: attempt to write to \'id\' attribute'
n_attr_diff = self['__type_node'].get(n_id)
if None == n_attr_diff: