diff --git a/cat-home/src/main/java/com/dianping/cat/report/task/product/ProductUpdateTask.java b/cat-home/src/main/java/com/dianping/cat/report/task/product/ProductUpdateTask.java
index fc193f6308cd777e959413db2917f9202972e4c2..e5637d16f364fa9c2775da994687e6f8e3033cfe 100644
--- a/cat-home/src/main/java/com/dianping/cat/report/task/product/ProductUpdateTask.java
+++ b/cat-home/src/main/java/com/dianping/cat/report/task/product/ProductUpdateTask.java
@@ -96,7 +96,7 @@ public class ProductUpdateTask implements Task, LogEnabled {
 			}
 		}
 
-		if (email != null && !"null".equals(email)) {
+		if (email != null && !"".equals(email) && !"null".equals(email)) {
 			infosMap.put("email", email.toString());
 		}