diff --git a/.mailmap b/.mailmap
index e06791f37dd..b6f14513320 100644
--- a/.mailmap
+++ b/.mailmap
@@ -70,6 +70,9 @@ Frederik Beaujean <beaujean@mpp.mpg.de> Frederik Beaujean <schoenerhans16@gmx.de
 Gaurav Gautam <gautam1168@gmail.com>
 Gaurav Gautam <gautam1168@gmail.com> gautam1168 <gautam1168@gmail.com>
 
+Gerrit Leck <gerritleck@web.de>
+Gerrit Leck <gerritleck@web.de> Gerrit Leck <g.leck@gsi.de>
+
 Isaac Smith <smithis7@msu.edu> 
 Isaac Smith <smithis7@msu.edu> Isaac Smith <71480393+smithis7@users.noreply.github.com>
 Isaac Smith <smithis7@msu.edu> smithis7 <71480393+smithis7@users.noreply.github.com>
diff --git a/tardis/plasma/properties/atomic.py b/tardis/plasma/properties/atomic.py
index d073c70030b..236edb01ecc 100644
--- a/tardis/plasma/properties/atomic.py
+++ b/tardis/plasma/properties/atomic.py
@@ -632,7 +632,7 @@ def _filter_atomic_property(self, zeta_data, selected_atoms):
         zeta_data_check = counter(zeta_data.atomic_number.values)
         keys = np.array(list(zeta_data_check.keys()))
         values = np.array(zeta_data_check.values())
-        if np.alltrue(keys + 1 == values):
+        if np.alltrue(keys + 1 == values) and keys:
             return zeta_data
         else:
             #            raise IncompleteAtomicData('zeta data')