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kotlinlang

I'm having a problem understanding why my code fails and passes based on some simple change. In my RetrofitAdapter class, if I have this property like this
```
private val httpLogging = HttpLoggingInterceptor().apply {
    level = HttpLoggingInterceptor.Level.BODY
  }

```
It crashes my app with error `java.lang.IllegalArgumentException: interceptor == null`, but if I change it to 
```
private val httpLogging 
      get() = HttpLoggingInterceptor().apply { 
        level = HttpLoggingInterceptor.Level.BODY 
      }
```
My app successfully runs. What are the reasons behind this?