Xray is throwing an error in log when accessing Jira's Integrity checker

Xray is throwing an error in log when accessing Jira's Integrity checker.

2019-02-02 14:08:39,331 http-nio-8080-exec-3 WARN admin 848x121x2 1n9y7ci 0:0:0:0:0:0:0:1 /rest/plugins/1.0/available/com.xpandit.plugins.xray-key/review [c.a.upm.pac.MarketplaceReviewsAndNotificationsServiceImpl] Marketplace returned error 401 when getting review at https://marketplace.atlassian.com/rest/2/addons/com.xpandit.plugins.xray/reviews/mine
2019-02-02 14:08:49,877 http-nio-8080-exec-8 ERROR admin 848x124x1 1n9y7ci 0:0:0:0:0:0:0:1 /secure/admin/views/XrayIntegrityChecker.jspa [velocity] Left side ($action.getInvalidIssues().size()) of '>' operation has null value at com.xpandit.plugins.xray:xray-actions//templates/config/integrity-checker.vm[line 300, column 61]