No such path error when suggesting reviewers

2016-04-06 23:02:16,667 ERROR [http-nio-9080-exec-5] hthi *1SFYL53x1382x4033469x9 151x9e8 172.22.52.117,172.24.12.146 "GET /rest/suggest-reviewers/1.0/by/ref HTTP/1.0" c.a.b.s.s.i.ScoringSuggestedReviewerService class com.atlassian.bitbucket.server.suggestreviewers.internal.suggester.BlameSuggester threw an exception (or returned unexpected data) when suggesting reviewers and was ignored.
com.atlassian.bitbucket.scm.CommandFailedException: '/usr/bin/git blame --incremental 79c7f0bac1f987487b1ec5b632d7e8c44a26c179 -- submodules/auth-engine' exited with code 128 saying: fatal: no such path submodules/auth-engine in 79c7f0bac1f987487b1ec5b632d7e8c44a26c179
        at com.atlassian.bitbucket.scm.DefaultCommandExitHandler.onError(DefaultCommandExitHandler.java:46) ~[bitbucket-spi-4.5.0-rc5.jar:na]
        at com.atlassian.bitbucket.scm.git.command.GitCommandExitHandler.evaluateThrowable(GitCommandExitHandler.java:106) ~[bitbucket-git-4.5.0-rc5.jar:na]
        at com.atlassian.bitbucket.scm.git.command.GitCommandExitHandler.onError(GitCommandExitHandler.java:160) ~[bitbucket-git-4.5.0-rc5.jar:na]
        at com.atlassian.bitbucket.scm.DefaultCommandExitHandler.onExit(DefaultCommandExitHandler.java:31) ~[bitbucket-spi-4.5.0-rc5.jar:na]
        at com.atlassian.bitbucket.scm.BaseCommand.callExitHandler(BaseCommand.java:138) ~[bitbucket-spi-4.5.0-rc5.jar:na]
        at com.atlassian.bitbucket.scm.BaseCommand$CommandFuture.internalGet(BaseCommand.java:252) ~[bitbucket-spi-4.5.0-rc5.jar:na]
        at com.atlassian.bitbucket.scm.BaseCommand$CommandFuture.get(BaseCommand.java:221) ~[bitbucket-spi-4.5.0-rc5.jar:na]
        at com.atlassian.bitbucket.scm.BaseCommand.call(BaseCommand.java:75) ~[bitbucket-spi-4.5.0-rc5.jar:na]
        at com.atlassian.bitbucket.server.suggestreviewers.internal.suggester.BlameSuggester.getBlame(BlameSuggester.java:148) ~[plugin_4770726787427263119_bitbucket-suggest-reviewers-2.1.5-SNAPSHOT.jar:na]
        at com.atlassian.bitbucket.server.suggestreviewers.internal.suggester.BlameSuggester.suggestFor(BlameSuggester.java:72) ~[plugin_4770726787427263119_bitbucket-suggest-reviewers-2.1.5-SNAPSHOT.jar:na]
        at com.atlassian.bitbucket.server.suggestreviewers.internal.ScoringSuggestedReviewerService.getSuggestedReviewers(ScoringSuggestedReviewerService.java:69) ~[plugin_4770726787427263119_bitbucket-suggest-reviewers-2.1.5-SNAPSHOT.jar:na]
        at com.atlassian.bitbucket.server.suggestreviewers.internal.rest.SuggestedReviewersResource.suggestReviewers(SuggestedReviewersResource.java:104) [plugin_4770726787427263119_bitbucket-suggest-reviewers-2.1.5-SNAPSHOT.jar:na]
        at com.atlassian.bitbucket.server.suggestreviewers.internal.rest.SuggestedReviewersResource.forRefs(SuggestedReviewersResource.java:84) [plugin_4770726787427263119_bitbucket-suggest-reviewers-2.1.5-SNAPSHOT.jar:na]
        at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:26) [applinks-plugin-5.0.5_1459358810000.jar:na]
        at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:26) [applinks-plugin-5.0.5_1459358810000.jar:na]
        at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:26) [applinks-plugin-5.0.5_1459358810000.jar:na]
        at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:26) [applinks-plugin-5.0.5_1459358810000.jar:na]
        at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:26) [applinks-plugin-5.0.5_1459358810000.jar:na]
        at com.atlassian.plugin.connect.plugin.auth.scope.ApiScopingFilter.doFilter(ApiScopingFilter.java:89) [atlassian-connect-plugin-1.1.70-bitbucket-01.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_1459358810000.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:122) [atlassian-connect-plugin-1.1.70-bitbucket-01.jar:na]
        at com.atlassian.plugin.connect.plugin.auth.oauth.OAuth2LOFilter.doFilter(OAuth2LOFilter.java:82) [atlassian-connect-plugin-1.1.70-bitbucket-01.jar:na]
        at com.atlassian.jwt.internal.servlet.JwtAuthFilter.doFilter(JwtAuthFilter.java:32) [jwt-plugin-1.5.5_1459358810000.jar:na]
        at com.atlassian.analytics.client.filter.DefaultAnalyticsFilter.doFilter(DefaultAnalyticsFilter.java:38) [analytics-client-5.2.1_1459358810000.jar:na]
        at com.atlassian.analytics.client.filter.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:39) [analytics-client-5.2.1_1459358810000.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:83) [bitbucket-service-impl-4.5.0-rc5.jar:na]
        at com.atlassian.stash.internal.hazelcast.ConfigurableWebFilter.doFilter(ConfigurableWebFilter.java:38) [classes/:na]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_25]
        at java.lang.Thread.run(Thread.java:745) [na:1.8.0_25]
        ... 233 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-4.5.0-rc5.jar:na]
        at com.atlassian.utils.process.ExternalProcessImpl.wrapUpProcess(ExternalProcessImpl.java:678) ~[atlassian-processutils-1.7.5.jar:na]
        at com.atlassian.utils.process.ExternalProcessImpl.finish(ExternalProcessImpl.java:161) ~[atlassian-processutils-1.7.5.jar:na]
        at com.atlassian.bitbucket.scm.BaseCommand$CommandFuture.get(BaseCommand.java:219) ~[bitbucket-spi-4.5.0-rc5.jar:na]
        ... 31 common frames omitted
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