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2 changes: 1 addition & 1 deletion meep_adjoint/optimization_problem.py
Original file line number Diff line number Diff line change
Expand Up @@ -217,7 +217,7 @@ def __call__(self, beta_vector=None, design=None,
If need_value or need_gradient is False, then fq or gradf in the return
tuple will be None.
"""
if beta_vector or design:
if (beta_vector is not None) or design:
self.update_design(beta_vector=beta_vector, design=design)

#######################################################################
Expand Down