diff --git a/win-module-system/win-module-system-biz/src/main/java/com/win/module/system/service/serialnumber/SerialNumberServiceImpl.java b/win-module-system/win-module-system-biz/src/main/java/com/win/module/system/service/serialnumber/SerialNumberServiceImpl.java
index 86489e72..2baf09fe 100644
--- a/win-module-system/win-module-system-biz/src/main/java/com/win/module/system/service/serialnumber/SerialNumberServiceImpl.java
+++ b/win-module-system/win-module-system-biz/src/main/java/com/win/module/system/service/serialnumber/SerialNumberServiceImpl.java
@@ -121,7 +121,7 @@ public class SerialNumberServiceImpl implements SerialNumberService {
         } else if(encodedRule.getPattern().toLowerCase().indexOf("y") > 0) {
             midnight = LocalDateTime.now().plusYears(1).plusMonths(1).plusDays(1).withHour(0).withMinute(0).withSecond(0).withNano(1);
         }
-        long millSeconds = ChronoUnit.SECONDS.between(LocalDateTime.now(), midnight);
+        long millSeconds = midnight == null ? 0 : ChronoUnit.SECONDS.between(LocalDateTime.now(), midnight);
         StringBuilder code = new StringBuilder();
         Long increment = redisCache.incr(encodedRule.getRuleCode() + pattern, millSeconds);
         code.append(encodedRule.getPrefix());