NPE when starting sprint

Because there is old data for sprints that have no sprint dates, any lookup for sprints will NPE

2012-03-22 18:28:50,363 http-9080-6 ERROR pobara 1108x1484x1 zlxwyc /rest/greenhopper/1.0/sprint/create/model.json [server.impl.application.WebApplicationImpl] Internal server error
java.lang.NullPointerException
at com.atlassian.greenhopper.service.sprint.SprintQueryServiceImpl$2.compare(SprintQueryServiceImpl.java:98)
at com.atlassian.greenhopper.service.sprint.SprintQueryServiceImpl$2.compare(SprintQueryServiceImpl.java:92)
at java.util.Arrays.mergeSort(Arrays.java:1270)
at java.util.Arrays.sort(Arrays.java:1210)
at java.util.Collections.sort(Collections.java:159)
at com.atlassian.greenhopper.service.sprint.SprintQueryServiceImpl.sortSprints(SprintQueryServiceImpl.java:91)
at com.atlassian.greenhopper.service.sprint.SprintQueryServiceImpl.getSprints(SprintQueryServiceImpl.java:86)
at com.atlassian.greenhopper.web.rapid.sprint.CreateSprintHelper.createDefaultSprintName(CreateSprintHelper.java:89)
at com.atlassian.greenhopper.web.rapid.sprint.CreateSprintResource$1.call(CreateSprintResource.java:89)
at com.atlassian.greenhopper.web.rapid.sprint.CreateSprintResource$1.call(CreateSprintResource.java:70)
at com.atlassian.greenhopper.web.util.RestCall.response(RestCall.java:48)
at com.atlassian.greenhopper.web.AbstractResource.response(AbstractResource.java:40)
at com.atlassian.greenhopper.web.rapid.sprint.CreateSprintResource.getStartModel(CreateSprintResource.java:69)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.atlassian.plugins.rest.common.interceptor.impl.DispatchProviderHelper$ResponseOutInvoker$1.invoke(DispatchProviderHelper.java:206)
at com.atlassian.plugins.rest.common.interceptor.impl.DispatchProviderHelper$1.intercept(DispatchProviderHelper.java:90)
at com.atlassian.plugins.rest.common.interceptor.impl.DefaultMethodInvocation.invoke(DefaultMethodInvocation.java:61)
at com.atlassian.plugins.rest.common.expand.interceptor.ExpandInterceptor.intercept(ExpandInterceptor.java:38)
at com.atlassian.plugins.rest.common.interceptor.impl.DefaultMethodInvocation.invoke(DefaultMethodInvocation.java:61)
at com.atlassian.plugins.rest.common.interceptor.impl.DispatchProviderHelper.invokeMethodWithInterceptors(DispatchProviderHelper.java:98)
at com.atlassian.plugins.rest.common.interceptor.impl.DispatchProviderHelper.access$100(DispatchProviderHelper.java:28)
at com.atlassian.plugins.rest.common.interceptor.impl.DispatchProviderHelper$ResponseOutInvoker._dispatch(DispatchProviderHelper.java:202)
at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:67)
at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:163)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:111)
at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:71)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:111)
at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:63)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:654)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:612)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:603) at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:309)