Please check null values for commits with empty comments

java.lang.NullPointerException
at java.util.regex.Matcher.getTextLength(Matcher.java:1140)
at java.util.regex.Matcher.reset(Matcher.java:291)
at java.util.regex.Matcher.<init>(Matcher.java:211)
at java.util.regex.Pattern.matcher(Pattern.java:888)
at com.atlassian.bamboo.v2.trigger.DefaultChangeDetectionManager.filterExcludedChangesets(DefaultChangeDetectionManager.java:597)
at com.atlassian.bamboo.v2.trigger.DefaultChangeDetectionManager.collectChangesSinceLastBuild(DefaultChangeDetectionManager.java:268)
at com.atlassian.bamboo.v2.trigger.DefaultChangeDetectionManager.collectChangesSinceRevisions(DefaultChangeDetectionManager.java:218)
at com.atlassian.bamboo.v2.trigger.DefaultChangeDetectionManager.collectChangesSinceRevisions(DefaultChangeDetectionManager.java:136)
at com.atlassian.bamboo.v2.trigger.DefaultChangeDetectionManager.collectAllChangesSinceLastBuild(DefaultChangeDetectionManager.java:123)
at com.atlassian.bamboo.v2.trigger.ManualBuildDetectionAction.performDelayedChangeDetection(ManualBuildDetectionAction.java:109)
at com.atlassian.bamboo.chains.ChainExecutionManagerImpl$2.getChainState(ChainExecutionManagerImpl.java:199)
at com.atlassian.bamboo.chains.ChainExecutionManagerImpl.tryStartChainState(ChainExecutionManagerImpl.java:252)
at com.atlassian.bamboo.chains.ChainExecutionManagerImpl.delayedStart(ChainExecutionManagerImpl.java:189)
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 org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:304)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at $Proxy78.delayedStart(Unknown Source)
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 org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:304)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:198)
at $Proxy79.delayedStart(Unknown Source)
at com.atlassian.bamboo.plan.PlanExecutionManagerImpl$1$1$1.call(PlanExecutionManagerImpl.java:262)
at com.atlassian.bamboo.plan.PlanExecutionManagerImpl$1$1$1.call(PlanExecutionManagerImpl.java:258)
at com.atlassian.util.concurrent.ManagedLocks$ManagedLockImpl.withLock(ManagedLocks.java:324)
at com.atlassian.bamboo.plan.PlanExecutionLockServiceImpl.lock(PlanExecutionLockServiceImpl.java:77)
at com.atlassian.bamboo.plan.PlanExecutionManagerImpl.doWithProcessLock(PlanExecutionManagerImpl.java:429)
at com.atlassian.bamboo.plan.PlanExecutionManagerImpl.access$200(PlanExecutionManagerImpl.java:44)
at com.atlassian.bamboo.plan.PlanExecutionManagerImpl$1$1.run(PlanExecutionManagerImpl.java:257)
at com.atlassian.bamboo.build.pipeline.concurrent.NamedThreadFactory$2.run(NamedThreadFactory.java:52)
at java.lang.Thread.run(Thread.java:662)