isRootCollection NPE during Site Import

java.lang.NullPointerException
        at org.sakaiproject.content.impl.BaseContentService.isRootCollection(BaseContentService.java:6829)
        at org.sakaiproject.content.impl.BaseContentService.getAllResources(BaseContentService.java:2504)
        at org.sakaiproject.content.impl.BaseContentService.updateEntityReferences(BaseContentService.java:8109)
        at org.sakaiproject.sitemanage.impl.SiteManageServiceImpl$2.doInTransactionWithoutResult(SiteManageServiceImpl.java:509)
        at org.springframework.transaction.support.TransactionCallbackWithoutResult.doInTransaction(TransactionCallbackWithoutResult.java:34)
        at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:133)
        at org.sakaiproject.sitemanage.impl.SiteManageServiceImpl.updateEntityReferences(SiteManageServiceImpl.java:506)
        at org.sakaiproject.sitemanage.impl.SiteManageServiceImpl.importToolsIntoSite(SiteManageServiceImpl.java:377)
        at org.sakaiproject.sitemanage.impl.SiteManageServiceImpl.lambda$importToolsIntoSiteThread$0(SiteManageServiceImpl.java:117)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)