diff --git a/cchloader/adapters/p1.py b/cchloader/adapters/p1.py
index dca80f2..6a4e6e6 100644
--- a/cchloader/adapters/p1.py
+++ b/cchloader/adapters/p1.py
@@ -55,8 +55,8 @@ def valid_measure(self, data):
         r2quality = int(data.get('r2quality'))
         r3quality = int(data.get('r3quality'))
         r4quality = int(data.get('r4quality'))
-        reserve1quality = int(data.get('reserve1quality'))
-        reserve2quality = int(data.get('reserve2quality'))
+        reserve1quality = int(data.get('reserve1quality') or 0)
+        reserve2quality = int(data.get('reserve2quality') or 0)
 
         aovalid = 0
         if aoquality < 128: