AbstractCollection.toArray() has thrown a ConcurrentModificationException

We found this prefix in 5 webpages.
MapChildren (5)Typical messages (2)TraceDetailed Map
  1. java.util.ConcurrentModificationException
    1.   at java.util.LinkedHashMap$LinkedHashIterator.nextNode()
    2.   at java.util.LinkedHashMap$LinkedKeyIterator.next()
    3.   at java.util.AbstractCollection.toArray()
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MessageNumber of crashes
null3
<No message>2
  1. java.util.ConcurrentModificationException
    1.   at java.util.LinkedHashMap$LinkedHashIterator.nextNode()
    2.   at java.util.LinkedHashMap$LinkedKeyIterator.next()
    3.   at java.util.AbstractCollection.toArray()