Stack Overflow when trying to add a repository

[schoeppi5]

When trying to add a repository configured like this:

helm {
  repositories {
    example {
      url = new URI('some/url')
      credentials {
        username = "username"
        password = "password"
      }
    }
  }
}

Using the rule helmAddExampleRepository fails with following stack trace:

> Task :helmAddExampleRepository

FAILURE: Build failed with an exception.

* What went wrong:
java.lang.StackOverflowError (no error message)

* Try:
Run with --debug option to get more log output. Run with --scan to get full insights.

* Exception is:
java.lang.StackOverflowError
	at org.gradle.api.internal.provider.DefaultPropertyState.getOrNull(DefaultPropertyState.java:138)
	at org.gradle.api.internal.provider.DefaultPropertyState.getOrNull(DefaultPropertyState.java:139)
	at org.gradle.api.internal.provider.DefaultPropertyState.getOrNull(DefaultPropertyState.java:139)
	at org.gradle.api.internal.provider.DefaultPropertyState.getOrNull(DefaultPropertyState.java:139)
	at org.gradle.api.internal.provider.DefaultPropertyState.getOrNull(DefaultPropertyState.java:139)
	at org.gradle.api.internal.provider.DefaultPropertyState.getOrNull(DefaultPropertyState.java:139)
	at org.gradle.api.internal.provider.DefaultPropertyState.getOrNull(DefaultPropertyState.java:139)
	at org.gradle.api.internal.provider.DefaultPropertyState.getOrNull(DefaultPropertyState.java:139)
	at org.gradle.api.internal.provider.DefaultPropertyState.getOrNull(DefaultPropertyState.java:139)
	at org.gradle.api.internal.provider.DefaultPropertyState.getOrNull(DefaultPropertyState.java:139)
	at org.gradle.api.internal.provider.DefaultPropertyState.getOrNull(DefaultPropertyState.java:139)
	at org.gradle.api.internal.provider.DefaultPropertyState.getOrNull(DefaultPropertyState.java:139)
	at org.gradle.api.internal.provider.DefaultPropertyState.getOrNull(DefaultPropertyState.java:139)
	at org.gradle.api.internal.provider.DefaultPropertyState.getOrNull(DefaultPropertyState.java:139)

Environment:

 gradle --version 

------------------------------------------------------------
Gradle 5.2.1
------------------------------------------------------------

Build time:   2019-02-08 19:00:10 UTC
Revision:     f02764e074c32ee8851a4e1877dd1fea8ffb7183

Kotlin DSL:   1.1.3
Kotlin:       1.3.20
Groovy:       2.5.4
Ant:          Apache Ant(TM) version 1.9.13 compiled on July 10 2018
JVM:          11.0.2 (Oracle Corporation 11.0.2+9-LTS)
OS:           Windows 10 10.0 amd64