Probably happens for classifications without a tag:
java.lang.NullPointerException
at java.base/java.util.Objects.requireNonNull(Objects.java:220)
at java.base/java.util.Optional.of(Optional.java:113)
at java.base/java.util.stream.ReduceOps$2ReducingSink.get(ReduceOps.java:129)
at java.base/java.util.stream.ReduceOps$2ReducingSink.get(ReduceOps.java:107)
at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:265)
at java.base/java.util.stream.ReferencePipeline.reduce(ReferencePipeline.java:677)
at link.biosmarcel.baka/link.biosmarcel.baka.view.PaymentFX.lambda$new$2(PaymentFX.java:39)
Probably happens for classifications without a tag: