diff --git a/app/assets/javascripts/app/controllers/ticket_zoom.js.coffee b/app/assets/javascripts/app/controllers/ticket_zoom.js.coffee
index bcb5adeb8..0556b85be 100644
--- a/app/assets/javascripts/app/controllers/ticket_zoom.js.coffee
+++ b/app/assets/javascripts/app/controllers/ticket_zoom.js.coffee
@@ -734,9 +734,12 @@ class Edit extends App.Controller
 
     @render()
 
-    if @defaults.body or Function('/*@cc_on return document.documentMode===10@*/')()
+    if @defaults.body or @isIE10()
       @open_textarea(null, true)
 
+  isIE10: ->
+    Function('/*@cc_on return document.documentMode===10@*/')()
+
   stopPropagation: (e) ->
     e.stopPropagation()
 
@@ -1028,7 +1031,7 @@ class Edit extends App.Controller
 
   close_textarea: =>
     @remove_textarea_catcher()
-    if !@textarea.text().trim() && !@attachments.length
+    if !@textarea.text().trim() && !@attachments.length && not @isIE10()
 
       @textarea.velocity
         properties: