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java.lang.NullPointerException: 	at java.util.HashMap.(Unknown Source)	at com.google.common.collect.Maps.newHashMap(Maps.java:136)	at com.atlassian.bamboo.variable.CustomVariableContextImpl.filterVariableContextByName(CustomVariableContextImpl.java:269)	at com.atlassian.bamboo.variable.CustomVariableContextImpl.substituteBambooVariables(CustomVariableContextImpl.java:159)	at com.atlassian.bamboo.variable.CustomVariableContextImpl.substituteString(CustomVariableContextImpl.java:129)	at com.atlassian.bamboo.build.VariableSubstitutionBeanImpl.substituteBambooVariables(VariableSubstitutionBeanImpl.java:51)	at com.atlassian.bamboo.build.VariableSubstitutionBeanImpl.substituteBambooVariables(VariableSubstitutionBeanImpl.java:36)	at com.sysbliss.bamboo.plugins.brmp.action.postrunners.TaggerRunner.runTagger(TaggerRunner.java:74)	at com.atlassian.bamboo.plugins.brmp.action.BRMPChainCompleteAction.execute(BRMPChainCompleteAction.java:61)	at com.atlassian.bamboo.chains.ChainPluginSupportImpl.chainCompleted(ChainPluginSupportImpl.java:94)	at com.atlassian.bamboo.chains.ChainExecutionManagerImpl.finaliseChainStateIfChainExecutionHasCompleted(ChainExecutionManagerImpl.java:531)	at com.atlassian.bamboo.chains.ChainExecutionManagerImpl.access$600(ChainExecutionManagerImpl.java:50)	at com.atlassian.bamboo.chains.ChainExecutionManagerImpl$1.run(ChainExecutionManagerImpl.java:282)	at com.atlassian.util.concurrent.ManagedLocks$ManagedLockImpl.withLock(ManagedLocks.java:333)	at com.atlassian.bamboo.chains.ChainExecutionManagerImpl.execute(ChainExecutionManagerImpl.java:241)	at com.atlassian.bamboo.chains.ChainExecutionManagerImpl.access$1000(ChainExecutionManagerImpl.java:50)	at com.atlassian.bamboo.chains.ChainExecutionManagerImpl$2.run(ChainExecutionManagerImpl.java:328)	at com.atlassian.util.concurrent.ManagedLocks$ManagedLockImpl.withLock(ManagedLocks.java:333)	at com.atlassian.bamboo.chains.ChainExecutionManagerImpl.handleEvent(ChainExecutionManagerImpl.java:308)	at sun.reflect.GeneratedMethodAccessor931.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	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.orm.hibernate.HibernateInterceptor.invoke(HibernateInterceptor.java:117)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)	at $Proxy49.handleEvent(Unknown Source)	at com.atlassian.event.legacy.LegacyListenerHandler$LegacyListenerInvoker.invoke(LegacyListenerHandler.java:55)	at com.atlassian.event.internal.AsynchronousAbleEventDispatcher$2.run(AsynchronousAbleEventDispatcher.java:60)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at com.atlassian.bamboo.build.pipeline.concurrent.NamedThreadFactory$2.run(NamedThreadFactory.java:50)	at java.lang.Thread.run(Unknown Source)