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-rw-r--r--fg21sim/extragalactic/clusters/main.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/fg21sim/extragalactic/clusters/main.py b/fg21sim/extragalactic/clusters/main.py
index 1aeb522..0be553a 100644
--- a/fg21sim/extragalactic/clusters/main.py
+++ b/fg21sim/extragalactic/clusters/main.py
@@ -216,6 +216,7 @@ class GalaxyClusters:
merger_mass_min=self.merger_mass_min)
clform.simulate_mergertree(main_only=True)
if self.use_max_merger:
+ # NOTE: may be ``None`` due to no mergers occurred at all!
mmev = clform.max_merger
else:
mmev = clform.recent_major_merger