diff --git a/server/model/monitor.js b/server/model/monitor.js
index 643d34a6..37abb39c 100644
--- a/server/model/monitor.js
+++ b/server/model/monitor.js
@@ -312,7 +312,11 @@ class Monitor extends BeanModel {
                             bean.msg += ", keyword is found";
                             bean.status = UP;
                         } else {
-                            throw new Error(bean.msg + ", but keyword is not found");
+                            data = data.replace(/<[^>]*>?|[\n\r]|\s+/gm, " ");
+                            if (data.length > 50) {
+                                data = data.substring(0, 47) + "...";
+                            }
+                            throw new Error(bean.msg + ", but keyword is not in [" + data + "]");
                         }
 
                     }