diff --git a/server/model/monitor.js b/server/model/monitor.js
index 1866fdb7c..fc8ad9e58 100644
--- a/server/model/monitor.js
+++ b/server/model/monitor.js
@@ -235,7 +235,7 @@ class Monitor extends BeanModel {
                             if ( data.length > 50 ) {
                                 data = data.substring(0, 47) + "...";
                             }
-                            throw new Error(bean.msg + ", but keyword is not in [ " + data + " ]");
+                            throw new Error(bean.msg + ", but keyword is not in [" + data + "]");
                         }
 
                     }