Kendo Grid- integer column filter Angular JS

Issue:object doesn't support property or method 'tolowercase' in kendo grid

When am trying to filter the bID columnam facing the above issue.But the other columns are working fine.

columns: [     
{
                    field: "bID", title: "ID", type: 'number', editor: disableEditor,
                    filterable: {
                        ui: function (element) {
                            element.kendoNumericTextBox({
                                format: '#',
                                decimals: 0,
                                spinners: false,
                                min:1
                            });
                        },
                        extra: false,
                        field: "bID",
                        operators: {
                            string: {
                                eq: "Is equal to",
                                neq: "Is not equal to"
                            }
                        }
                    }
                },

]

Please help me where am doing wrong.

Source: AngularJS

from Angular Questions https://angularquestions.com/2017/10/05/kendo-grid-integer-column-filter-angular-js/
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