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-rw-r--r--miasm2/ir/translators/z3_ir.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/miasm2/ir/translators/z3_ir.py b/miasm2/ir/translators/z3_ir.py
index 79099520..e0460cc4 100644
--- a/miasm2/ir/translators/z3_ir.py
+++ b/miasm2/ir/translators/z3_ir.py
@@ -141,7 +141,7 @@ class TranslatorZ3(Translator):
         for subexpr, start, stop in args:
             sube = self.from_expr(subexpr)
             e = z3.Extract(stop-start-1, 0, sube)
-            if res:
+            if res != None:
                 res = z3.Concat(e, res)
             else:
                 res = e