Null Pointer exception in Dropdownbyindex

Dear Forum,

I am using a dropdownbyindex to populate values from R/3.

My requiremnt is initially the dropdown will show emply field. The user will select a value and submit. But if the user does not select and submits, the UI is throwing a Nullpointer exception.

I can avoid the null value in dropdown by setting the selection as 1...1 ; but this is not serving the purpose of blank value initially.

Please help me asap.

Thanks and regards,

Mickey.