How to keep same image during update in laravel without choosing image once again?

I want to update some records. Though I didnot want update image and click on update buuton, It shows me error- "Call to a member function getClientOriginalName() on null"

Here is my controller public function update(Request $request) { $participants = new participants;

     $file = $request->file("select_file");

      if($request->hasfile("select_file"))
      {
        $file->move("public/images/",$file->getClientOriginalName());
      }

        $id                   = $request->id;
        $First_name          =  $request->First_name;
        $Last_name           =  $request->Last_name;
        $Date_of_Birth       =  $request->Date_of_Birth;
        $GST_no             =  $request->GST_no;
        $email              =  $request->email;
        $Mobile_No           =  $request->Mobile_No;
        $Company_name        =  $request->Company_name;
        $Address             =  $request->Address;
        $State              =  $request->State;
        $City               =  $request->City;
        $Pincode             =  $request->Pincode;
        $Country             =  $request->Country;
        $Amount              =  $request->Amount;
        // $Image                = $request->Image;
        $Image                = $file->getClientOriginalName();


DB::table('participants')
 ->where('id',$id )
->update(['First_name'=>$First_name,'Last_name'=>$Last_name,'Date_of_Birth'=>$Date_of_Birth,'GST_no'=>$GST_no,'email'=>$email,'Mobile_No'=>$Mobile_No,'Company_name'=>$Company_name,'Address'=>$Address,'State'=>$State,'City'=>$City,'Pincode'=>$Pincode,'Country'=>$Country,'Amount'=>$Amount,'Image'=>$Image]);


$participants->update();



session()->flash('success','Data Updated successfully!');
return redirect()->back();
//return back()->with('error','Update Data successfully!');
}

view page

Image}}"> Image}}" alt="Image not Found" style="width:100px; height:100px;" />

I want the data to be updated with previous image(since I donot want to update image).

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