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-rw-r--r--miasm2/analysis/ssa.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/miasm2/analysis/ssa.py b/miasm2/analysis/ssa.py
index 036d92ca..489b4328 100644
--- a/miasm2/analysis/ssa.py
+++ b/miasm2/analysis/ssa.py
@@ -366,6 +366,7 @@ class SSADiGraph(SSA):
 
     def transform(self, head):
         """Transforms into SSA"""
+        assert not self.graph.predecessors(head)
         self._init_variable_defs(head)
         self._place_phi(head)
         self._rename(head)