diff --git a/reactor.py b/reactor.py
index 356a986..5e0c69b 100644
--- a/reactor.py
+++ b/reactor.py
@@ -13,7 +13,7 @@ class Glimpse():
         self.nuc_u = nucleon_union
         self.elt_u = self.nuc_u.linked_electron_union()
         self.lastest_date = -1
-        self.next_date = -1
+        self.next_date = 0x3f3f3f3f
         self.avg_efactor = 0
         self.total_num = 0
         self.activated_num = 0
@@ -28,9 +28,13 @@ class Glimpse():
                 if i['is_activated']:
                     self.avg_efactor += i['efactor']
                     self.activated_num += 1
+            if self.next_date == 0x3f3f3f3f:
+                self.next_date = -1
             if self.activated_num == 0:
                 return
             self.avg_efactor = round(self.avg_efactor / self.activated_num, 2)
+            if self.next_date == 0x3f3f3f3f:
+                self.next_date = -1
         return
 
 class Apparatus():