Getting this error on beta commons right now, on a page where there is no existing depicts item:
load.php?debug=false&lang=en&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=0sgfkzu:51 jQuery.Deferred exception: Cannot read property 'indexOf' of undefined TypeError: Cannot read property 'indexOf' of undefined at MediaInfoStatementsItemWidget.statements.ItemWidget.buildTitle (<anonymous>:684:450) at <anonymous>:684:255 at mightThrow (https://commons.wikimedia.beta.wmflabs.org/w/load.php?debug=false&lang=en&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=0sgfkzu:48:856) at process (https://commons.wikimedia.beta.wmflabs.org/w/load.php?debug=false&lang=en&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=0sgfkzu:49:516) undefined
I suspect this is just a case of attempting to setData() with incomplete/missing data, or setData() incorrectly processing such data.