diff --git a/src/case/trigger/trigger.text.select.js b/src/case/trigger/trigger.text.select.js
index fad37b1ce..5a171be2e 100644
--- a/src/case/trigger/trigger.text.select.js
+++ b/src/case/trigger/trigger.text.select.js
@@ -60,7 +60,7 @@ BI.SelectTextTrigger = BI.inherit(BI.Trigger, {
             };
         }
 
-        val = BI.isArray(val) ? val : [val];
+        val = BI.isArray(val) ? val.slice() : [val];
 
         var result = [];