JQL of "!~" thrown java.lang.NullPointerException and saved filter caused System Error

java.lang.NullPointerException
	at com.atlassian.jira.issue.search.searchers.transformer.AbstractSearchInputTransformer.validateParams(AbstractSearchInputTransformer.java:109)
	at com.atlassian.jira.plugin.issuenav.service.DefaultSearcherService.getValueResults(DefaultSearcherService.java:244)
	at com.atlassian.jira.plugin.issuenav.service.DefaultSearcherService.getSearchResults(DefaultSearcherService.java:178)
	at com.atlassian.jira.plugin.issuenav.service.DefaultSearcherService.searchWithJql(DefaultSearcherService.java:172)
	at com.atlassian.jira.plugin.issuenav.IssueNavAction.performSearch(IssueNavAction.java:716)
	at com.atlassian.jira.plugin.issuenav.IssueNavAction.doNav(IssueNavAction.java:224)
	at com.atlassian.jira.plugin.issuenav.IssueNavAction.doDefault(IssueNavAction.java:157)
	at sun.reflect.GeneratedMethodAccessor575.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at webwork.util.InjectionUtils$DefaultInjectionImpl.invoke(InjectionUtils.java:70)
	at webwork.util.InjectionUtils.invoke(InjectionUtils.java:56)
	at webwork.action.ActionSupport.invokeCommand(ActionSupport.java:433)
	at webwork.action.ActionSupport.execute(ActionSupport.java:157)
......