jQuery Grid Plugin - jqGrid

Hello,

the jqGrid documentaiton states the following:

To construct this element, editoptions must contain a set of value:label pairs with the value separated from the label with a colon (:). These sets of pairs can be either a string or an array. For example, both

colModel : [ ... {name:'myname', edittype:'select' editoptions:{value:"1:One;2:Two"} } ... ]

And colModel :

[ ... {name:'myname', edittype:'select', editoptions:{value:{1:'One',2:'Two'}} } ... ]

are correct and can be used as a 'select' definition.

I tried this and it doesn't work for me. There's an error message:

$t.sopt.value.split is not a function

Seems to me if the check what format is given (string or array) is missing or buggy. Is this a known issue?