مشکل در store کردن فرم

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SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (`siliuser`.`weekly_reports`, CONSTRAINT `weekly_reports_consultant_id_foreign` FOREIGN KEY (`consultant_id`) REFERENCES `consultant_information` (`id`) ON DELETE CASCADE ON UPDATE CASCADE) (SQL: insert into `weekly_reports` (`title`, `body`, `user_id`, `student_id`, `consultant_id`, `updated_at`, `created_at`) values (kjb, <p>lkn</p>, 1, 1, 4, 2020-11-13 08:22:12, 2020-11-13 08:22:12))

ReportController.php [ store ]

 $report = new Report();
        $report->title = request('title');
        $report->body = request('body');
        $report->user_id = request('students');
        $report->student_id = request('students');
        $report->consultant_id = $request->user()->id;
        $report->save();

        return redirect(route('admin.'));

Migration

        Schema::create('weekly_reports', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->string('title');
            $table->text('body');
            $table->string('slug')->nullable();
            // Relation with 'users' Table
            $table->unsignedBigInteger('user_id')->index()->unsigned();
            $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade')->onUpdate('cascade');

            //Relation with 'student_information' Table
            $table->unsignedBigInteger('student_id')->index();
            $table->foreign('student_id')->references('id')->on('student_information')->onDelete('cascade')->onUpdate('cascade');

            //Relation with 'consultant_information' Table
            $table->unsignedBigInteger('consultant_id')->index();
            $table->foreign('consultant_id')->references('id')->on('consultant_information')->onDelete('cascade')->onUpdate('cascade');

            $table->timestamps();

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