SQLSTATE[42S21]: Column already exists

Ошибка SQLSTATE[42S21]: Column already exists: 1060 Duplicate column name 'created_at'

public function up()
    {
        Schema::create('blog_posts', function (Blueprint $table) {
            $table->bigIncrements('id');

            $table->bigInteger('category_id')->unsigned();
            $table->bigInteger('user_id')->unsigned();

            $table->string('slug')->unique();
            $table->string('title');

            $table->text('excerpt')->nullable();

            $table->text('content_raw');
            $table->text('content_html');

            $table->boolean('is_published')->default(false);
            $table->timestamp('published_at')->nullable();

            $table->timestamps();
            $table->softDeletes();

            $table->foreign('user_id')->references('id')->on('users');
            $table->foreign('category_id')->references('id')->on('blog_categories');
            $table->index('is_published');

            $table->timestamps();
        });
    }