diff --git a/DNN Platform/Modules/DigitalAssets/FileProperties.ascx.cs b/DNN Platform/Modules/DigitalAssets/FileProperties.ascx.cs
index efe68c8407f..883c7929aed 100644
--- a/DNN Platform/Modules/DigitalAssets/FileProperties.ascx.cs	
+++ b/DNN Platform/Modules/DigitalAssets/FileProperties.ascx.cs	
@@ -74,7 +74,8 @@ protected string ActiveTab
         {
             get
             {
-                return Request.QueryString["activeTab"];
+                var activeTab = Request.QueryString["activeTab"];
+                return string.IsNullOrEmpty(activeTab) ? "" : System.Text.RegularExpressions.Regex.Replace(activeTab, "[^\\w]", "");
             }
         }
 
@@ -174,7 +175,7 @@ protected override void OnLoad(EventArgs e)
                 Exceptions.ProcessModuleLoadException(this, exc);
             }
         }
-        
+
         private void OnItemUpdated()
         {
             SetFilePreviewInfo();
@@ -231,7 +232,7 @@ private void SetPropertiesAvailability(bool availability)
         private void SetFilePreviewInfo()
         {
             var previewPanelInstance = (PreviewPanelControl)previewPanelControl;
-            previewPanelInstance.SetPreviewInfo(controller.GetFilePreviewInfo(file, fileItem));            
+            previewPanelInstance.SetPreviewInfo(controller.GetFilePreviewInfo(file, fileItem));
         }
 
         private void PrepareFilePreviewInfoControl()