diff --git a/models/user_business_analysis.go b/models/user_business_analysis.go
index 19a24dbac..1223224ee 100644
--- a/models/user_business_analysis.go
+++ b/models/user_business_analysis.go
@@ -674,5 +674,8 @@ func subMonth(t1, t2 time.Time) (month int) {
 	}
 	monthInterval %= 12
 	month = yearInterval*12 + monthInterval
+	if month == 0 {
+		month = 1
+	}
 	return month
 }