HashMap.get() has thrown a NullPointerException

We found this prefix in 3 webpages.
MapChildren (3)Typical messages (2)TraceDetailed Map
  1. java.lang.NullPointerException
    1.   at $Proxy.hashCode()
    2.   at java.util.Collections.secondaryHash()
    3.   at java.util.HashMap.get()
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MessageNumber of crashes
Expected to unbox a 'int' primitive type but was returned null2
Expected to unbox a 'int' primitive type but was returned null D/IOP_DB_BT( 3537): db_query: id DisableSniff :: key KEY_BDADDR, value 20:15:12:17:73:98 D/IOP_DB_BT( 3537): db_query: result 1 D/IOP_DB_BT( 3537): db_query: id ExtendSniffTime :: key KEY_BDADD1
  1. java.lang.NullPointerException
    1.   at $Proxy.hashCode()
    2.   at java.util.Collections.secondaryHash()
    3.   at java.util.HashMap.get()
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