diff --git a/src/main/java/com/eactive/eai/custom/statistics/collector/HourStatsAggregator.java b/src/main/java/com/eactive/eai/custom/statistics/collector/HourStatsAggregator.java
index b3be7b2..49f03f7 100644
--- a/src/main/java/com/eactive/eai/custom/statistics/collector/HourStatsAggregator.java
+++ b/src/main/java/com/eactive/eai/custom/statistics/collector/HourStatsAggregator.java
@@ -189,6 +189,7 @@ public class HourStatsAggregator {
 		long systemErr = systemErrCnt.get();
 		long bizErr = bizErrCnt.get();
 		long success = total - (timeout + systemErr + bizErr);
+		success = Math.max(0, success);  // 음수 방지
 
 		stats.setTotalCnt(total);
 		stats.setSuccessCnt(success);
diff --git a/src/main/java/com/eactive/eai/custom/statistics/collector/MinuteStatsAggregator.java b/src/main/java/com/eactive/eai/custom/statistics/collector/MinuteStatsAggregator.java
index 5bb94cf..396e569 100644
--- a/src/main/java/com/eactive/eai/custom/statistics/collector/MinuteStatsAggregator.java
+++ b/src/main/java/com/eactive/eai/custom/statistics/collector/MinuteStatsAggregator.java
@@ -189,6 +189,7 @@ public class MinuteStatsAggregator {
 		long systemErr = systemErrCnt.get();
 		long bizErr = bizErrCnt.get();
 		long success = total - (timeout + systemErr + bizErr);
+		success = Math.max(0, success);  // 음수 방지
 
 		stats.setTotalCnt(total);
 		stats.setSuccessCnt(success);