Hello Monks

I am working on Perl Database project and I am stuck at one problem. In my project I am using DBIx::Class to perform the database operations.But for the following function my script is getting aborted.The function causing problem is as follows:

sub _get_user_scenario
{
     my ($self, $schema, $user_scenario) = @_; 
     my $user_scenario_rs = undef;
     my $user_scenario_desc;
     #     In the case where the description is not Null
    if($user_scenario->{description}){
         $user_scenario_desc= $user_scenario->{description};
    }else{
Line #799 ===>         $user_scenario_desc = $schema->resultset("UserS
+cenario")->search({
                  "name" =>$user_scenario->{name},
                  })->first->description;
    }
    
    eval{
        #get the number of user scenarios in the database table
        my $count = $schema->resultset("UserScenario")->count();
        
        #insert user scenario, or if already in database, update the d
+escription
        $user_scenario_rs =
                          $schema->resultset("UserScenario")->update_o
+r_create(
                 { name  => $user_scenario->{name},
                  description => $user_scenario_desc, },
                 { key   => "u_user_scenario_name" },
             ) || die "Unable to update/insert data to table UserScena
+rio: $!\n";
    };
     
    if($@){
         #warn();
         $self->log_writer()->write_error_row("Unable to get/insert da
+ta to table UserScenario: $@");
         return undef;
     }else{
         $self->log_writer()->write_row("Inserted values into user_sce
+nario table");
         print"Inserted values into user_scenario table\n";
         return $user_scenario_rs;
    }
}
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Here I am trying to insert some values into user_scenario table.Among those values I am trying to insert the value for description if it is already defined in the hash else I am trying to extract it's value using search function. But this case is not working for the user_scenarios whose description is not stored in the hash as well as not present in the database.I am getting an error like this for line # 799 is as follows(in the code line # is specified)

Can't call method "description" on an undefined value at DataLoader/Inserter.pm line 799.

Kindly help me out to deal with this DBIx error. Thanks in advance !!!!