In the month view of the scheduler there is a code accessing the task title without checking if it is null, line 62 in "kendo.scheduler.monthview.js".
EVENT_TEMPLATE = kendo.template('<div title="#=title.replace(/"/g,"&\\#34;")#">' +
'<div class="k-event-template">#:title#</div>' +
'</div>');
so if there is a task with a null title (why someone will enter a task without a title :) ) the entire month view will not work.