---
sympy/physics/secondquant.py | 6 ++++--
1 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/sympy/physics/secondquant.py b/sympy/physics/secondquant.py
index 858c222..6a5fa60 100644
--- a/sympy/physics/secondquant.py
+++ b/sympy/physics/secondquant.py
@@ -2666,8 +2666,10 @@ def arg_iterator(seq):
for req, dummylist in cases:
if isinstance(expr,Add):
- new_dummies = dummylist
- expr = (Add(*[_substitute(term, new_dummies, arg_iterator, **req)
for term in expr.args]))
+ expr = (Add(*[_substitute(term, dummylist, arg_iterator, **req)
for term in expr.args]))
+ else:
+ expr = _substitute(expr, dummylist, arg_iterator, **req)
+
return expr
--
1.6.5
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