diff --git a/sbws/lib/v3bwfile.py b/sbws/lib/v3bwfile.py
index 6465892d1e99fafb068f34b089667edb53e3d39d..245ffa6ae74a373b79f52271094b93be7487ced9 100644
--- a/sbws/lib/v3bwfile.py
+++ b/sbws/lib/v3bwfile.py
@@ -379,7 +379,8 @@ class V3BWHeader(object):
         # failures = attempts - all mesaurements
         # Works only in the case that old measurements files already had
         # measurements count
-        if recent_measurement_attempt_count is not None:
+        # If this is None or 0, the failures can't be calculated
+        if recent_measurement_attempt_count:
             all_measurements = 0
             for result_list in results.values():
                 all_measurements += len(result_list)