diff --git a/cat-home/src/main/java/com/dianping/cat/report/page/problem/transform/ProblemStatistics.java b/cat-home/src/main/java/com/dianping/cat/report/page/problem/transform/ProblemStatistics.java
index 9656407a9aa2be37c4081f3bc95c9a337de5a22c..132583b93f3e38273c0b18d304b122424aeb695a 100644
--- a/cat-home/src/main/java/com/dianping/cat/report/page/problem/transform/ProblemStatistics.java
+++ b/cat-home/src/main/java/com/dianping/cat/report/page/problem/transform/ProblemStatistics.java
@@ -19,7 +19,22 @@ import com.dianping.cat.report.page.problem.LongConfig;
 
 public class ProblemStatistics extends BaseVisitor {
 
-	private Map<String, TypeStatistics> m_status = new TreeMap<String, TypeStatistics>();
+	private Map<String, TypeStatistics> m_status = new TreeMap<String, TypeStatistics>(new Comparator<String>() {
+
+		@Override
+		public int compare(String str1, String str2) {
+			if (str1.equals(str2)) {
+				return 0;
+			}
+			if ("error".equals(str1)) {
+				return -1;
+			}
+			if ("error".equals(str2)) {
+				return 1;
+			}
+			return str1.compareTo(str2);
+		}
+	});
 
 	private boolean m_allIp = false;