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-rw-r--r--lj_matrix/lj_matrix.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lj_matrix/lj_matrix.py b/lj_matrix/lj_matrix.py
index c3b61becb..6739ae283 100644
--- a/lj_matrix/lj_matrix.py
+++ b/lj_matrix/lj_matrix.py
@@ -88,7 +88,7 @@ def lj_matrix(mol_data,
z = (z_i-z_j)**2
if i == j:
- if not diag_value:
+ if diag_value is None:
lj[i, j] = (0.5*Z_i**2.4)
else:
lj[i, j] = diag_value