jqGrid 4.0, Firefox 3.6.16

How to repeate error:

1. click Add (“+”)
2. click Cancel
3. click Add (“+”)

Error “fld[0] is undefined. if( fld[0].type=='checkbox' ) {” in grid.formedit.js#L488

How to fix error: replace in grid.formedit.js#L473

if(fld && fld[0] !== null)

->

if(fld && fld.length && fld[0] !== null)