1 files changed, 1 insertions, 0 deletions
diff --git a/event.py b/event.py
index bf7c007..5b93f17 100644
--- a/event.py
+++ b/event.py
@@ -46,6 +46,7 @@ class Event(object):
         self.gen_total_energy = gen_total_energy
 
         self.subtracks = []
+        self.nphoton = 0
         self.photon_start = None
         self.photon_stop = None
         self.channels = None