diff --git src/wp-includes/js/tinymce/plugins/wpview/plugin.js src/wp-includes/js/tinymce/plugins/wpview/plugin.js
index 337b3d2..b2e3c62 100644
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tinymce.PluginManager.add( 'wpview', function( editor ) { |
293 | 293 | |
294 | 294 | // Fix issue with deselecting a view in IE8. Without this hack, clicking content above the view wouldn't actually deselect it |
295 | 295 | // and the caret wouldn't be placed at the mouse location |
296 | | if( tinymce.Env.ie <= 8 ) { |
| 296 | if( tinymce.Env.ie && tinymce.Env.ie <= 8 ) { |
297 | 297 | deselectEventType = 'mouseup'; |
298 | 298 | } else { |
299 | 299 | deselectEventType = 'mousedown'; |