Blame generates an error when a commit contains a submodule change

2016-10-11 06:42:11,707 DEBUG [http-nio-7990-exec-11] charlie @JNZNWLx402x857x0 1hpenhy 192.168.123.1 "GET /rest/api/latest/projects/EH/repos/mirror-mirror/browse/mirror-submodule HTTP/1.1" c.a.bitbucket.scm.BaseCommand Executed /bin/git cat-file -t c9684722001a291632ae6f92f265c4ed79584df7:mirror-submodule
2016-10-11 06:42:11,753 DEBUG [http-nio-7990-exec-11] charlie @JNZNWLx402x857x0 1hpenhy 192.168.123.1 "GET /rest/api/latest/projects/EH/repos/mirror-mirror/browse/mirror-submodule HTTP/1.1" c.a.s.i.r.e.ServiceExceptionMapper Mapping ServiceException to REST response 500
com.atlassian.bitbucket.scm.CommandFailedException: '/bin/git cat-file -t c9684722001a291632ae6f92f265c4ed79584df7:mirror-submodule' exited with code 128 saying: error: unable to find 1cc23dedd2c31ba8d7471fb7282ece43cfcf6b9e
fatal: git cat-file c9684722001a291632ae6f92f265c4ed79584df7:mirror-submodule: bad file
	at com.atlassian.bitbucket.scm.DefaultCommandExitHandler.onError(DefaultCommandExitHandler.java:46) ~[bitbucket-spi-4.9.1.jar:na]
	at com.atlassian.bitbucket.scm.git.command.GitCommandExitHandler.evaluateThrowable(GitCommandExitHandler.java:104) ~[na:na]
	at com.atlassian.bitbucket.scm.git.command.GitCommandExitHandler.onError(GitCommandExitHandler.java:201) ~[na:na]
	at com.atlassian.bitbucket.scm.DefaultCommandExitHandler.onExit(DefaultCommandExitHandler.java:31) ~[bitbucket-spi-4.9.1.jar:na]
	at com.atlassian.bitbucket.scm.BaseCommand.callExitHandler(BaseCommand.java:146) ~[bitbucket-spi-4.9.1.jar:na]
	at com.atlassian.bitbucket.scm.BaseCommand$CommandFuture.internalGet(BaseCommand.java:272) ~[bitbucket-spi-4.9.1.jar:na]
	at com.atlassian.bitbucket.scm.BaseCommand$CommandFuture.get(BaseCommand.java:241) ~[bitbucket-spi-4.9.1.jar:na]
	at com.atlassian.bitbucket.scm.BaseCommand.call(BaseCommand.java:83) ~[bitbucket-spi-4.9.1.jar:na]
	at com.atlassian.stash.internal.content.DefaultContentService.getType(DefaultContentService.java:68) ~[bitbucket-service-impl-4.9.1.jar:na]
	at com.atlassian.plugin.util.ContextClassLoaderSettingInvocationHandler.invoke(ContextClassLoaderSettingInvocationHandler.java:26) ~[atlassian-plugins-core-4.2.4.jar:na]
	at org.eclipse.gemini.blueprint.service.importer.support.internal.aop.ServiceInvoker.doInvoke(ServiceInvoker.java:56) ~[na:na]
	at org.eclipse.gemini.blueprint.service.importer.support.internal.aop.ServiceInvoker.invoke(ServiceInvoker.java:60) ~[na:na]
	at org.eclipse.gemini.blueprint.service.util.internal.aop.ServiceTCCLInterceptor.invokeUnprivileged(ServiceTCCLInterceptor.java:70) ~[na:na]
	at org.eclipse.gemini.blueprint.service.util.internal.aop.ServiceTCCLInterceptor.invoke(ServiceTCCLInterceptor.java:53) ~[na:na]
	at org.eclipse.gemini.blueprint.service.importer.support.LocalBundleContextAdvice.invoke(LocalBundleContextAdvice.java:57) ~[na:na]
	at com.atlassian.stash.internal.rest.content.ContentResource.getContent(ContentResource.java:95) ~[bitbucket-rest-4.9.1.jar:na]
	at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:24) [applinks-plugin-5.2.2_1472696114000.jar:na]
	at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:24) [applinks-plugin-5.2.2_1472696114000.jar:na]
	at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:24) [applinks-plugin-5.2.2_1472696114000.jar:na]
	at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:24) [applinks-plugin-5.2.2_1472696114000.jar:na]
	at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:24) [applinks-plugin-5.2.2_1472696114000.jar:na]
	at com.atlassian.analytics.client.filter.UniversalAnalyticsFilter.doFilter(UniversalAnalyticsFilter.java:92) [analytics-client-5.2.9_1472696114000.jar:na]
	at com.atlassian.analytics.client.filter.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:39) [analytics-client-5.2.9_1472696114000.jar:na]
	at com.atlassian.plugin.connect.plugin.auth.scope.ApiScopingFilter.doFilter(ApiScopingFilter.java:81) [atlassian-connect-plugin-1.1.86-bitbucket-04.jar:na]
	at com.atlassian.stash.internal.spring.security.StashAuthenticationFilter.doFilter(StashAuthenticationFilter.java:88) [classes/:na]
	at com.atlassian.stash.internal.web.auth.BeforeLoginPluginAuthenticationFilter.doInsideSpringSecurityChain(BeforeLoginPluginAuthenticationFilter.java:109) [classes/:na]
	at com.atlassian.stash.internal.web.auth.BeforeLoginPluginAuthenticationFilter.doFilter(BeforeLoginPluginAuthenticationFilter.java:75) [classes/:na]
	at com.atlassian.security.auth.trustedapps.filter.TrustedApplicationsFilter.doFilter(TrustedApplicationsFilter.java:94) [atlassian-trusted-apps-core-4.2.0.jar:na]
	at com.atlassian.oauth.serviceprovider.internal.servlet.OAuthFilter.doFilter(OAuthFilter.java:67) [atlassian-oauth-service-provider-plugin-2.0.3_1472696114000.jar:na]
	at com.atlassian.core.filters.ServletContextThreadLocalFilter.doFilter(ServletContextThreadLocalFilter.java:21) [atlassian-core-4.6.19.jar:na]
	at com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:31) [atlassian-core-4.6.19.jar:na]
	at com.atlassian.plugin.connect.plugin.auth.user.ThreeLeggedAuthFilter.doFilter(ThreeLeggedAuthFilter.java:109) [atlassian-connect-plugin-1.1.86-bitbucket-04.jar:na]
	at com.atlassian.jwt.internal.servlet.JwtAuthFilter.doFilter(JwtAuthFilter.java:32) [jwt-plugin-1.5.11-0002_1472696114000.jar:na]
	at com.atlassian.analytics.client.filter.DefaultAnalyticsFilter.doFilter(DefaultAnalyticsFilter.java:38) [analytics-client-5.2.9_1472696114000.jar:na]
	at com.atlassian.analytics.client.filter.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:39) [analytics-client-5.2.9_1472696114000.jar:na]
	at com.atlassian.stash.internal.web.auth.BeforeLoginPluginAuthenticationFilter.doBeforeBeforeLoginFilters(BeforeLoginPluginAuthenticationFilter.java:87) [classes/:na]
	at com.atlassian.stash.internal.web.auth.BeforeLoginPluginAuthenticationFilter.doFilter(BeforeLoginPluginAuthenticationFilter.java:73) [classes/:na]
	at com.atlassian.stash.internal.request.DefaultRequestManager.doAsRequest(DefaultRequestManager.java:86) ~[bitbucket-service-impl-4.9.1.jar:na]
	at com.atlassian.stash.internal.hazelcast.ConfigurableWebFilter.doFilter(ConfigurableWebFilter.java:38) ~[classes/:na]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) ~[na:1.8.0_73]
	at java.lang.Thread.run(Unknown Source) ~[na:1.8.0_73]
	... 288 frames trimmed
Caused by: com.atlassian.utils.process.ProcessException: Non-zero exit code: 128
	at com.atlassian.bitbucket.scm.SummarizingProcessHandler.complete(SummarizingProcessHandler.java:47) ~[bitbucket-spi-4.9.1.jar:na]
	at com.atlassian.utils.process.ExternalProcessImpl.wrapUpProcess(ExternalProcessImpl.java:680) ~[atlassian-processutils-1.7.6.jar:na]
	at com.atlassian.utils.process.ExternalProcessImpl.finish(ExternalProcessImpl.java:161) ~[atlassian-processutils-1.7.6.jar:na]
	at com.atlassian.bitbucket.scm.BaseCommand$CommandFuture.get(BaseCommand.java:239) ~[bitbucket-spi-4.9.1.jar:na]
	... 35 common frames omitted