TreeSet.addAll() has thrown a NullPointerException

We found this prefix in 6 webpages.
MapChildren (5)Typical messages (2)TraceDetailed Map
  1. java.lang.NullPointerException
    1.   at java.util.TreeMap.put()
    2.   at java.util.TreeSet.add()
    3.   at java.util.AbstractCollection.addAll()
    4.   at java.util.TreeSet.addAll()
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  2. NullPointerException

    Thread.run()
    Crashes:2
    Projects:0
    Web Pages:2
    Error Reports:0
    First:3 weeks ago
    Last:3 weeks ago
    preview
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    Last:1 year ago
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    Last:2 years ago
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MessageNumber of crashes
<No message>5
Could not generate api file for 'Alerts'1
  1. java.lang.NullPointerException
    1.   at java.util.TreeMap.put()
    2.   at java.util.TreeSet.add()
    3.   at java.util.AbstractCollection.addAll()
    4.   at java.util.TreeSet.addAll()