adding attachment crashes if filename too short?

here is the message returned on your own server:

500 Internal Server Error
java.lang.IllegalArgumentException: Prefix string too short at http.utils.multipartrequest.TempFile.createTempFile(TempFile.java) at http.utils.multipartrequest.MultipartRequest.parse(MultipartRequest.java) at http.utils.multipartrequest.MultipartRequest.init(MultipartRequest.java) at http.utils.multipartrequest.MultipartRequest.<init>(MultipartRequest.java) at http.utils.multipartrequest.ServletMultipartRequest.<init>(ServletMultipartRequest.java) at webwork.multipart.PellMultiPartRequest.<init>(PellMultiPartRequest.java:79) at webwork.multipart.MultiPartRequestWrapper.<init>(MultiPartRequestWrapper.java:51) at webwork.dispatcher.ServletDispatcher.wrapRequest(ServletDispatcher.java:284) at webwork.dispatcher.ServletDispatcher.service(ServletDispatcher.java:142) at javax.servlet.http.HttpServlet.service(HttpServlet.java:336) at com.evermind[Orion/1.6.0 (build 10770)]._it.doFilter(.:59) at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:128) at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:60) at com.evermind[Orion/1.6.0 (build 10770)]._ir.doFilter(.:16) at com.atlassian.core.security.SecurityFilter.doFilter(SecurityFilter.java:170) at com.evermind[Orion/1.6.0 (build 10770)]._ir.doFilter(.:20) at com.atlassian.core.security.LoginFilter.doFilter(LoginFilter.java:173) at com.evermind[Orion/1.6.0 (build 10770)]._ir.doFilter(.:20) at com.atlassian.util.filters.ProfilingFilter.doFilter(Unknown Source) at com.evermind[Orion/1.6.0 (build 10770)]._ir.doFilter(.:20) at com.atlassian.jira.web.filters.EncodingFilter.doFilter(EncodingFilter.java:53) at com.evermind[Orion/1.6.0 (build 10770)]._ir.doFilter(.:20) at com.orionserver[Orion/1.6.0 (build 10770)].http.patch.PathInvalidationFilter.doFilter(PathInvalidationFilter.java:150) at com.evermind[Orion/1.6.0 (build 10770)]._efb._plc(.:380) at com.evermind[Orion/1.6.0 (build 10770)]._efb._adc(.:174) at com.evermind[Orion/1.6.0 (build 10770)]._cs._yqb(.:614) at com.evermind[Orion/1.6.0 (build 10770)]._cs._yrb(.:189) at com.evermind[Orion/1.6.0 (build 10770)]._bx.run(.:62)