Collections.unmodifiableSet() has thrown a NullPointerException

We found this prefix in 9 webpages.
MapChildren (8)Typical messages (2)TraceDetailed Map
  1. java.lang.NullPointerException
    1.   at java.util.Collections$UnmodifiableCollection.<init>()
    2.   at java.util.Collections$UnmodifiableSet.<init>()
    3.   at java.util.Collections.unmodifiableSet()
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  1. NullPointerException with 2.5.5

    First:15 years ago
    Last:2 years ago
    Author:3004
  2. NullPointerException

    Crashes:2
    Projects:0
    Web Pages:2
    Error Reports:0
    First:6 months ago
    Last:6 months ago
    preview
  3. GitHub iconGitHub comment 557#247999015

    First:2 years ago
    Last:2 years ago
    Author:danilovesky
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    Last:1 year ago
    Author:Steve Lukis
  5. GitHub iconGitHub comment 61#331523138

    First:1 year ago
    Last:5 months ago
    Author:saledouble
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    First:4 years ago
    Last:3 years ago
    Author:ranjeetb
  7. GitHub iconGitHub comment 599#254888963

    First:2 years ago
    Last:2 years ago
    Author:hikrrish
  8. GitHub iconError if different tools are activated on the same model open in different tabs

    First:2 years ago
    Last:2 years ago
    Author:workcraft-lp
MessageNumber of crashes
<No message>8
null1
  1. java.lang.NullPointerException
    1.   at java.util.Collections$UnmodifiableCollection.<init>()
    2.   at java.util.Collections$UnmodifiableSet.<init>()
    3.   at java.util.Collections.unmodifiableSet()
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