If use Pie Chart Report:
Error 500: Sorry, we had some technical problems during your last operation.
java.lang.ArrayIndexOutOfBoundsException: 0
java.lang.ArrayIndexOutOfBoundsException: 0 at sun.font.CompositeStrike.getStrikeForSlot(CompositeStrike.java:75) [?:1.8.0_102]
Maybe this article helps you? https://confluence.atlassian.com/jirakb/all-time-related-dashboard-gadgets-reports-and-database-monitoring-not-working-in-jira-hosted-in-rhel-7-935910501.html
Apparently it could be related to your RedHat version.
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