Exception Handling in Postgis function

Hi

I am new in the postgressql. I am trying to using the exception handling for
the postgis function. The query is as follows.

"SELECT topology.AddEdge('road_topology', ST_GeomFromText(l.linestring,
4326)) As edgeid
from
(SELECT ST_AsText(geom) as linestring FROM public.clip_linestring) as l;"

This query is showing error as follows

ERROR: Edge intersects (not on endpoints) with existing edge 162 at or near
point POINT(100.3812061 13.6915724)

I would like to implement exception handling so that I could know from which
line of table "clip_linestring" this error is coming.

How do I use the exception handling for these kind of issue.

Thank you.

Regards,
Saurav Ranjit

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