performing query operations in Room ORM restarts my application

I am using Room to save objects in the database. and any time I perform an operation like insert or get all my application restarts.

this is my entity class:

@Entity
class Task(
    @PrimaryKey val id: Int,
    @ColumnInfo(name = "title") val title : String,
    @ColumnInfo(name = "detail") val detail : String
)

this is my database class:

@Database(entities = [Task::class], version = 1)
abstract class AppDatabase : RoomDatabase() {

    abstract fun taskDao() : TaskDao
    companion object{
        var INSTANCE: AppDatabase? = null
        fun getAppDatabase(context: Context): AppDatabase? {
            if (INSTANCE == null) {
                INSTANCE = Room.databaseBuilder(
                    context,
                    AppDatabase::class.java,
                    "task-database"
                )
                .build()
            }
            return INSTANCE
        }
    }
}

I try calling it from my AndroidViewModel class like this:

class AddTaskViewModel(application: Application) : AndroidViewModel(application) {

    private val context = application

    var title : MutableLiveData<String> = MutableLiveData("")
    var detail : MutableLiveData<String> = MutableLiveData("")

    fun saveTask(){
        val task = Task(id = 1, title = title.value!!, detail = detail.value!! )
        val taskDao : TaskDao? = AppDatabase.getAppDatabase(context)?.taskDao()
        taskDao!!.insertAll(task)
        Toast.makeText(context, "it is done", Toast.LENGTH_LONG).show()
    }

    fun changeTitle(text: String){
        title.value = text
    }

    fun changeDetail(text: String){
        detail.value = text
    }
}

and at the point where taskDao!!.insertAll(task) is called the app restarts.