Application works in IE8 but has problems using IE9 Application works in IE 8 but not on client’s machine which has IE 9.

Below are the details about infragistics control version and errors we are getting in IE 9. I have also attached screen shot from F12 debugging tools.
Infragistics version - Infragistics4.WebUI.UltraWebGrid.v10.3,( 10.3.20103.1013)
Errors/exception
•         Unable to get property 'init' of undefined or null reference
•         Unable to get property 'apply' of undefined or null reference
•         igtbl_StateChange          <not available>
•         igtbl_StateChange          function igtbl_StateChange(type, grid, obj, value) { if (arguments.length > 0) this.init(type, grid, obj, value); }