Invalid date time format: 1366 Incorrect integer value

Hi

while inserting a record I am getting an error.

SQLSTATE[22007]: Invalid datetime format: 1366 Incorrect integer value: '' for column `usermanagement`.`estimate_lists`.`lead_id` at row 1 (SQL: insert into `estimate_lists` (`estimate_date`, `valiuntill_date`, `client_id`, `lead_id`, `tax`, `second_tax`, `notes`, `updated_at`, `created_at`) values (2020-03-04, 2020-03-11, 2, , 10%, 10%, testing, 2020-03-04 09:38:45, 2020-03-04 09:38:45))

I used mutators but getting the same error when I tried to validate in the controller I am getting the same error. I am inserting a record using ajax.

model

// this is not working

public function setAttribute($key, $value)
    {
        if(in_array($key, ['estimate_date', 'valiuntill_date'])){
            $this->attributes[$key] = Carbon::createFromFormat('d-m-Y', $value)->format('Y-m-d');
        
            return $this;
        } 
        return parent::setAttribute($key, $value);
    }

controller

public function store(Request $request)
    {

        if(preg_match("/[a-z]/i",$request->client))
        {
            $leadid = ltrim($request->client,"le");
            $clientid ='';

        }
        else
        {
            $leadid = '';
            $clientid = $request->client;
        }

        $estimatedate = Carbon::parse($request->estimatedate)->format('Y-m-d');
        $validate = Carbon::parse($request->validuntill)->format('Y-m-d');

        EstimateList::create([
            'estimate_date' => $estimatedate,
            'valiuntill_date' => $validate,
            'client_id' => $clientid,
            'lead_id' => $leadid,
            'tax' => $request->tax,
            'second_tax' => $request->secondtax,
            'notes' => $request->notes,    
        ]); 

        return response()->json('Estimate List Added Successfully');

         
    }       

thank you