We created couple of custom issue type in JIRA 6.2.7, then import a CVS file which includes custom issue type, got error like:
Unexpected failure occurred. Importer will stop immediately. Data may be in an unstable state java.lang.NullPointerException at com.atlassian.jira.plugins.importer.imports.importer.impl.customfields.CustomFieldsUtil.createOptionIfDoesNotExist(CustomFieldsUtil.java:215)
But if we import default issue type within in JIRA, like Bug, New Feature, then it works well.
Make sure that you have these custom issue types for this project that you're trying to import the CSV file.
If you have, try to import with the default issue type, then perform a bulk edit, moving to the custom issue type.
I recently ran into this issue and found we needed to correct the Issue Type associations for pre-existing Custom Fields the CSV was trying to populate. Here is the KB article with resolution steps:
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