Error from JIRA: Unexpected failure occurred. Importer will stop immediately. Data maybe in an unstable state

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Logfile:
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2012-02-16 10:21:12,736 INFO - Import started by admin using com.atlassian.jira.plugins.importer.imports.fogbugz.FogBugzDataBean
2012-02-16 10:21:12,751 INFO - ------------------------------
2012-02-16 10:21:12,751 INFO - Importing: Users
2012-02-16 10:21:12,751 INFO - ------------------------------
2012-02-16 10:21:12,751 INFO - Only new items will be imported
2012-02-16 10:21:12,892 INFO - 32 users associated with import.
2012-02-16 10:21:13,095 INFO - Imported user Alf Burghardt (aburghardt)
2012-02-16 10:21:13,189 INFO - Imported user Erwin Sauter (esauter)
2012-02-16 10:21:13,267 INFO - Imported user Exxcellent (exxcellent)
2012-02-16 10:21:13,377 INFO - Imported user G�nther Hafner (ghafner)
2012-02-16 10:21:13,502 INFO - Imported user Martin Wimmer (mwimmer)
2012-02-16 10:21:13,595 INFO - Imported user Roland Fr�wis (rfr�wis)
2012-02-16 10:21:13,674 INFO - Imported user Sourish Halder (shalder)
2012-02-16 10:21:13,799 INFO - Imported user Thomas Hassler (thassler)
2012-02-16 10:21:13,877 INFO - Imported user Volker Manusch (vmanusch)
2012-02-16 10:21:13,877 INFO - ------------------------------
2012-02-16 10:21:13,877 INFO - Finished Importing : Users
2012-02-16 10:21:13,877 INFO - ------------------------------
2012-02-16 10:21:13,877 INFO - 9 users successfully created.
2012-02-16 10:21:13,877 INFO - Retrieving custom fields...
2012-02-16 10:21:13,877 INFO - Retrieving projects...
2012-02-16 10:21:13,877 INFO - ------------------------------
2012-02-16 10:21:13,877 INFO - Importing: Issues
2012-02-16 10:21:13,877 INFO - ------------------------------
2012-02-16 10:21:13,877 INFO - Only new items will be imported
2012-02-16 10:21:13,955 INFO - ------------------------------
2012-02-16 10:21:13,955 INFO - Finished Importing : Issues
2012-02-16 10:21:13,955 INFO - ------------------------------
2012-02-16 10:21:13,955 ERROR - Unexpected failure occurred. Importer will stop immediately. Data maybe in an unstable state
com.atlassian.jira.plugins.importer.SQLRuntimeException: Incorrect syntax near ')'.
at com.atlassian.jira.plugins.importer.web.JdbcConnection.queryDb(JdbcConnection.java:177)
at com.atlassian.jira.plugins.importer.web.JdbcConnection.queryDb(JdbcConnection.java:146)
at com.atlassian.jira.plugins.importer.imports.fogbugz.FogBugzDataBean.getTotalIssues(FogBugzDataBean.java:96)
at com.atlassian.jira.plugins.importer.imports.importer.impl.DefaultJiraDataImporter.doImport(DefaultJiraDataImporter.java:295)
at com.atlassian.jira.plugins.importer.imports.importer.impl.ImporterCallable.call(ImporterCallable.java:25)
at com.atlassian.jira.plugins.importer.imports.importer.impl.ImporterCallable.call(ImporterCallable.java:14)
at com.atlassian.jira.task.TaskManagerImpl$TaskCallableDecorator.call(TaskManagerImpl.java:359)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at com.atlassian.multitenant.impl.DefaultMultiTenantManager.runForTenant(DefaultMultiTenantManager.java:61)
at com.atlassian.multitenant.juc.MultiTenantExecutors$WrappedRunnable.run(MultiTenantExecutors.java:160)
at com.atlassian.jira.task.ForkedThreadExecutor$ForkedRunnableDecorator.run(ForkedThreadExecutor.java:249)
at java.lang.Thread.run(Thread.java:662)
Caused by: java.sql.SQLException: Incorrect syntax near ')'.
at net.sourceforge.jtds.jdbc.SQLDiagnostic.addDiagnostic(SQLDiagnostic.java:368)
at net.sourceforge.jtds.jdbc.TdsCore.tdsErrorToken(TdsCore.java:2820)
at net.sourceforge.jtds.jdbc.TdsCore.nextToken(TdsCore.java:2258)
at net.sourceforge.jtds.jdbc.TdsCore.getMoreResults(TdsCore.java:632)
at net.sourceforge.jtds.jdbc.JtdsStatement.executeSQLQuery(JtdsStatement.java:477)
at net.sourceforge.jtds.jdbc.JtdsPreparedStatement.executeQuery(JtdsPreparedStatement.java:778)
at com.atlassian.jira.plugins.importer.web.JdbcConnection.queryDb(JdbcConnection.java:162)
... 15 more
2012-02-16 10:21:13,955 INFO - No issues need to be reindexed.

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Configuration:
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{
"field" :

{ "sCustomerEmail" : "Customer Email", "sComputer" : "Computer" }

,
"link" :

{ "Duplicates" : "Duplicate", "See also" : "Relates", "Parent / Subcase" : "Relates" }

,
"value" : {
"sStatus" :

{ "Closed" : "6", "Aktiv" : "4", "Gelöst" : "4" }

,
"workflowScheme" : "IZfM",
"sStatus (Resolution)" :

{ "existiert bereits" : "3", "beantwortet" : "4", "auf Rückmeldung wartend" : "4", "mit Absicht" : "2", "wird nicht implementiert" : "2", "wird nicht beantwortet" : "2", "abgeschlossen" : "1", "SPAM" : "2", "behoben" : "1", "Duplikat" : "4", "wird nicht behoben" : "2", "nicht reproduzierbar" : "4", "implementiert" : "1", "gestrichen" : "2", "verschoben" : "4" }

},
"projectLead" : {
},
"projectName" : {
},
"projectKey" : {
},
"projectSelection" :

{ "PiWeb" : "true", "IT-Probleme" : "true", "Sample Project" : "true", "Involute" : "true", "Blade Pro" : "true", "Lasercal" : "true", "ScanWare" : "true", "Inbox" : "true" }

}