Screenshot of Console Error and Blanked Page

This bug was found when testing per the sixth and seventh comment at Bug 53708
This is very similar to Bug 54331 , however, this one is reproducible.

System Environment:
Windows7 X64 SP1
Google Chrome 29.0.1547.66 m

Test Url:
https://www.mediawiki.org/wiki/Project:Sandbox?veaction=edit

Steps to reproduce:
Enable ULS IME hi transliteration
Input the following (below the 'Testing Area' heading):
agar[SPACE][SPACE][BACKSPACE][BACKSPACE]

What happens:
Apart from a bunch of buggy behaviour described in the seventh comment at Bug 53708 , the template is entirely removed and the following console error shows up once the second [BACKSPACE] is pressed:

Uncaught TypeError: Cannot call method 'getOffset' of null load.php?debug=false&lang=hi&modules=ext.visualEditor.core%2Cdata%2Cexperim…PageTarget.icons-vector%7Crangy&skin=vector&version=20130919T025548Z&*:231
ve.ce.Document.getNodeAndOffset load.php?debug=false&lang=hi&modules=ext.visualEditor.core%2Cdata%2Cexperim…PageTarget.icons-vector%7Crangy&skin=vector&version=20130919T025548Z&*:231
ve.ce.Surface.showSelection load.php?debug=false&lang=hi&modules=ext.visualEditor.core%2Cdata%2Cexperim…PageTarget.icons-vector%7Crangy&skin=vector&version=20130919T025548Z&*:287
ve.ce.Surface.onChange load.php?debug=false&lang=hi&modules=ext.visualEditor.core%2Cdata%2Cexperim…PageTarget.icons-vector%7Crangy&skin=vector&version=20130919T025548Z&*:274
oo.EventEmitter.emit load.php?debug=false&lang=hi&modules=ext.visualEditor.base%2Cmediawiki%2Cvi…ck%7Coojs%7Cunicodejs.wordbreak&skin=vector&version=20130919T025548Z&*:139
ve.dm.Surface.change load.php?debug=false&lang=hi&modules=ext.visualEditor.core%2Cdata%2Cexperim…wPageTarget.icons-vector%7Crangy&skin=vector&version=20130919T025548Z&*:86
ve.ce.Surface.handleDelete load.php?debug=false&lang=hi&modules=ext.visualEditor.core%2Cdata%2Cexperim…PageTarget.icons-vector%7Crangy&skin=vector&version=20130919T025548Z&*:286
ve.ce.Surface.onDocumentKeyDown load.php?debug=false&lang=hi&modules=ext.visualEditor.core%2Cdata%2Cexperim…PageTarget.icons-vector%7Crangy&skin=vector&version=20130919T025548Z&*:267
proxy load.php?debug=false&lang=hi&modules=jquery%2Cmediawiki%2CSpinner%7Cjquery.…l%7Cmw.MwEmbedSupport&only=scripts&skin=vector&version=20130912T173512Z:10
ve.EventSequencer.onEvent load.php?debug=false&lang=hi&modules=ext.visualEditor.core%2Cdata%2Cexperim…wPageTarget.icons-vector%7Crangy&skin=vector&version=20130919T025548Z&*:19
(anonymous function) load.php?debug=false&lang=hi&modules=ext.visualEditor.core%2Cdata%2Cexperim…wPageTarget.icons-vector%7Crangy&skin=vector&version=20130919T025548Z&*:18
jQuery.event.dispatch load.php?debug=false&lang=hi&modules=jquery%2Cmediawiki%2CSpinner%7Cjquery.…l%7Cmw.MwEmbedSupport&only=scripts&skin=vector&version=20130912T173512Z:45
elemData.handle.eventHandle load.php?debug=false&lang=hi&modules=jquery%2Cmediawiki%2CSpinner%7Cjquery.…l%7Cmw.MwEmbedSupport&only=scripts&skin=vector&version=20130912T173512Z:38

The file urls are:

https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=hi&modules=ext.visualEditor.core%2Cdata%2Cexperimental%2Cicons-vector%7Cext.visualEditor.viewPageTarget.icons-vector%7Crangy&skin=vector&version=20130919T025548Z&*

https://bits.wikimedia.org/www.mediawiki.org/load.php?debug=false&lang=hi&modules=jquery%2Cmediawiki%2CSpinner%7Cjquery.triggerQueueCallback%2CloadingSpinner%2CmwEmbedUtil%7Cmw.MwEmbedSupport&only=scripts&skin=vector&version=20130912T173512Z

Version: unspecified
Severity: normal

Attached: