java.lang.NullPointerException: null value in entry: url=null

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java.lang.NullPointerException: null value in entry: url=null
at com.google.common.collect.CollectPreconditions.checkEntryNotNull(CollectPreconditions.java:33)
at com.google.common.collect.SingletonImmutableBiMap.(SingletonImmutableBiMap.java:39)
at com.google.common.collect.ImmutableBiMap.of(ImmutableBiMap.java:49)
at com.craigslist.Temp.reveal_hidden_phone_numbers(Temp.java:38)
at com.craigslist.Temp.main(Temp.java:23)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)

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