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, 1 year ago
java.lang.NullPointerException at java.util.TimSort.countRunAndMakeAscending(TimSort.java:351) at java.util.TimSort.sort(TimSort.java:230) at java.util.Arrays.sort(Arrays.java:1512) at java.util.ArrayList.sort(ArrayList.java:1454) at java.util.Collections.sort(Collections.java:175)