NullPointerException deleting unset reports from old app version

[DrDerico]

Hi! I catched this exception with Acra 4.8.1

Caused by: java.lang.NullPointerException
    at java.util.TimSort.sort(TimSort.java:169)
    at java.util.Arrays.sort(Arrays.java:2090)
    at org.acra.file.BulkReportDeleter.deleteReports(BulkReportDeleter.java:31)
    at org.acra.util.ApplicationStartupProcessor.deleteUnsentReportsFromOldAppVersion(ApplicationStartupProcessor.java:43)
    at org.acra.ACRA.init(ACRA.java:216)
    at com.drderico.towerd.myApp.onCreate(myApp.java:22)
    at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:969)
    at android.app.ActivityThread.handleBindApplication(ActivityThread.java:3290)
    ... 10 more

[william-ferguson-au]

Thanks