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kotlinlang

I wrote this function
```    tailrec fun find(
        filter: Bson? = null,
        projection: Bson? = null,
        sort: Bson? = null,
        limit: Int? = null,
        tries: Int = 3,
        delayBetweenTries: Long = 2500L
    ): Iterable&lt;T&gt; {```
I get a `java.lang.NullPointerException` on the `delayBetweenTries` line, the first `at` line of the stacktrace says `MongoFinder.find$default(MongoFinder.kt:40)`
I have no idea why this occurs, here's the call:
```val channels = mongoFinder.find(projection = include("title", "externalId", "platform"))```