got a problem here. dunno how to fix

in user.php

#SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (prism.rfq_table, CONSTRAINT rfq_table_userid_foreign FOREIGN KEY (userid) REFERENCES users (id) ON DELETE CASCADE ON UPDATE CASCADE) (SQL: insert into rfq_table (projectStart, projectEnd, budgetMax, budgetMin, itemDetails, qty, itemName, updated_at, created_at) values (1996-03-04, 1992-03-04, 50, 200, lkdad, 21, lskadkasd, 2017-03-04 07:05:08, 2017-03-04 07:05:08))

RFQ Controller.php

public function store(Request $request)
{

        $user=Auth::user();
        $rfq= $user->rfq_table()->create($request->all());
        return redirect()->route('rfq.index');

 }

User.php

  public function rfq_table()

    {

        return $this->belongsTo(RFQ::class);

    }