Laravel factory startup error Array to string conversion

In my Laravel project I am using the Astrotomic Laravel Translatable package. I want to create a factory to generate random data.My factory code

public function definition(): array
{
    $locales = ['uk', 'ru'];

    $translations = collect($locales)->mapWithKeys(function($locale) {
        return [
            $locale => [
                'slug' => fake()->unique()->randomNumber(4) . '-' . fake()->slug(3),
                'name' => fake()->unique()->name(),
                'description' => fake()->text(),
                'education' => fake()->text(),
            ]
        ];
    })->toArray();

    return array_merge([
        'city_id' => City::get()->random()->id,
        'degree' => fake()->numberBetween(1, 2),
        'qualification' => fake()->numberBetween(1, 3),
        'start_year' => fake()->year(),
        'viewed' => fake()->numberBetween(50, 5500),
        'status' => true,
        'image' => fake()->imageUrl(250, 250),
        'sort_order' => fake()->numberBetween(0, 10),
        'created_at' => fake()->dateTimeBetween('-4 week', '-3 week'),
        'updated_at' => fake()->dateTimeBetween('-2 week', '-1 week'),
    ], $translations);
}

I get an error when starting the factory, please help me(

   ErrorException

  Array to string conversion

  at vendorlaravelframeworksrcIlluminateSupportStr.php:964
    960▕
    961▕         $result = array_shift($segments);
    962▕
    963▕         foreach ($segments as $segment) {
  ➜ 964▕             $result .= (array_shift($replace) ?? $search).$segment;
    965▕         }
    966▕
    967▕         return $result;
    968▕     }

  1   vendorlaravelframeworksrcIlluminateSupportStr.php:964
      IlluminateFoundationBootstrapHandleExceptions::IlluminateFoundationBootstrap{closure}()

  2   vendorlaravelframeworksrcIlluminateDatabaseQueryException.php:67
      IlluminateSupportStr::replaceArray()