diff --git a/python/tvm/relay/transform/memory_plan.py b/python/tvm/relay/transform/memory_plan.py
index a6c2c11745ed..e359a9e3def0 100644
--- a/python/tvm/relay/transform/memory_plan.py
+++ b/python/tvm/relay/transform/memory_plan.py
@@ -243,7 +243,7 @@ def mk_let(self, dynamic_regions):
         def _mk_let(bindings, body):
             for var, value in reversed(bindings):
                 assert var
-                assert value
+                assert value is not None
                 assert body
                 body = expr.Let(var, value, body)
                 if var in dynamic_regions: