Can't import JSD project

When importing JIRA Service Desk projects with issue data, NullPointerException errors could appear with the following message:

The import was aborted because there were too many errors. Some errors are listed below. For full details about the errors please see your logs. Please note that some elements have been created. You may want to consult your logs to see what caused the errors, delete the project, and perform the import again.
2018-01-31 16:12:13,625 JiraTaskExectionThread-50 INFO vpolonskiy 971x35786x1 1nrvllq 69.106.51.118,172.16.106.30 /secure/admin/ProjectImportSummary.jspa [c.a.j.imports.project.DefaultProjectImportManager] Creating custom field values.
2018-01-31 16:12:13,661 JiraTaskExectionThread-50 ERROR vpolonskiy 971x35786x1 1nrvllq 69.106.51.118,172.16.106.30 /secure/admin/ProjectImportSummary.jspa [c.a.j.imports.xml.DefaultBackupXmlParser] Unexpected import failure
java.lang.NullPointerException
at com.awnaba.projectconfigurator.transporter.jsdimportextension.RequestTypeMapper.retrieveSourceRequestType(RequestTypeMapper.java:120)
at com.awnaba.projectconfigurator.transporter.jsdimportextension.RequestTypeMapper.findMappingFor(RequestTypeMapper.java:62)