Catch Exception on not ASSIGNing the Field Symbol?

Hi,

Am assigning some content to field symbol with the below statement,

<fs> TYPE ANY.

ASSIGN (v_field_name) TO <fs>.

I am aware of that, if its not ASSIGNs system will throw dump!! But, I want to avoide this dump, so, pls. let me know, How to handle it? actually, i know it(IF ASSIGNS-TRY-CATCH EXCEPPTION), but, at this point I forgot it

Thank you