SQLSTATE

i want to create new suggestion, but it show the error below https://imgur.com/a/MoBXpgX

database for suggestion shown below https://imgur.com/a/B31h2U8

this is my create.blade

@extends('layouts.app')

@section('content')
    <div class="col-sm-9">
        <h1>Create Suggestion</h1>

        {!! Form::open(['method' => 'POST', 'action' => ['[email protected]']]) !!}


        <div class="container-fluid" id="dynamic_field">
            {{--store data form in array for multiple suggestion--}}

            <table class="table table-bordered" id="dynamic_field">
                <tr>
                    <td>
                        {!! Form::textarea('suggestion', null , ['class' => 'form-control', 'placeholder' => 'Suggestion']) !!}

                    </td>
                    <td>
                        {!! Form::text('category', null , ['class' => 'form-control', 'placeholder' => 'Category']) !!}
                    </td>
                </tr>
            </table>
        </div>

        <br/>
        {{--{!! Form::submit('Create Suggestion', ['class'=>'btn btn-primary btn-lg col-sm-12']) !!}--}}
        <button type="submit" class="btn btn-danger" onclick="return confirm('Successful creating !')">Create Suggestion</button>
        {!! Form::close() !!}

    </div>

@endsection

this is my controller

<?php

namespace App\Http\Controllers;

use App\Suggestion;
use Illuminate\Http\Request;

class SuggestionController extends Controller
{
    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index()
    {
        $suggestions = Suggestion::all();


        return view('admin.suggestion.index',compact('suggestions'));
    }

    /**
     * Show the form for creating a new resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function create()
    {
        return view('admin.suggestion.create');
    }

    /**
     * Store a newly created resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    public function store(Request $request)
    {
//        return $request->all();

//        $suggestions = $request->input('suggestion');

        $suggestion = [
            'suggestion', 'category' => $request->input('suggestion','category')
        ];

        Suggestion::create($suggestion);

        return redirect()->back();
    }

    /**
     * Display the specified resource.
     *
     * @param  \App\Suggestion  $suggestion
     * @return \Illuminate\Http\Response
     */
    public function show(Suggestion $suggestion)
    {
        //
    }

    /**
     * Show the form for editing the specified resource.
     *
     * @param  \App\Suggestion  $suggestion
     * @return \Illuminate\Http\Response
     */
    public function edit(Suggestion $suggestion)
    {
        $id=$suggestion->id;
        $suggestion=Suggestion::findOrFail($id);
        return view('admin.suggestion.edit', compact('suggestion'));
    }

    /**
     * Update the specified resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \App\Suggestion  $suggestion
     * @return \Illuminate\Http\Response
     */
    public function update(Request $request, $id)
    {
        $suggestion= Suggestion::findOrFail($id);
        $suggestions=$request->input('suggestion');
        $suggestion->update(['suggestion'=>$suggestions]);

        return redirect()->back();
    }

    /**
     * Remove the specified resource from storage.
     *
     * @param  \App\Suggestion  $suggestion
     * @return \Illuminate\Http\Response
     */
    public function destroy(Suggestion $suggestion)
    {
        $id=$suggestion->id;
        Suggestion::findOrFail($id)->delete();
        return redirect('/suggestion');
    }
}