Plugin Fails Intermittently: SyncBranchBuildNumberAction: com.pti.bamboo.buildnumber.lifecycle.SyncBranchBuildNumberAction

This plugin fails intermittently for us. Sometimes it works perfectly, sometimes it fails with the following error:
java.lang.AbstractMethodError: com.pti.bamboo.buildnumber.lifecycle.SyncBranchBuildNumberAction.execute(Lcom/atlassian/bamboo/chains/Chain;Lcom/atlassian/bamboo/chains/ChainExecution;)V
    at com.atlassian.bamboo.chains.ChainPluginSupportImpl.lambda$chainStarted$1(ChainPluginSupportImpl.java:113)
    at com.atlassian.bamboo.chains.ChainPluginSupportImpl$1.call(ChainPluginSupportImpl.java:94)
    at com.atlassian.bamboo.chains.ChainPluginSupportImpl$1.call(ChainPluginSupportImpl.java:90)
    at com.atlassian.bamboo.plugin.BambooPluginUtils.callUnsafeCode(BambooPluginUtils.java:53)
    at com.atlassian.bamboo.chains.ChainPluginSupportImpl.callActionFunction(ChainPluginSupportImpl.java:90)
    at com.atlassian.bamboo.chains.ChainPluginSupportImpl.lambda$withCustomVariableContext$0(ChainPluginSupportImpl.java:82)
    at com.atlassian.bamboo.variable.CustomVariableContextImpl.withVariableSubstitutor(CustomVariableContextImpl.java:174)
    at com.atlassian.bamboo.variable.CustomVariableContextRunnerImpl.execute(CustomVariableContextRunnerImpl.java:31)
    at com.atlassian.bamboo.chains.ChainPluginSupportImpl.withCustomVariableContext(ChainPluginSupportImpl.java:82)
    at com.atlassian.bamboo.chains.ChainPluginSupportImpl.chainStarted(ChainPluginSupportImpl.java:113)
    at sun.reflect.GeneratedMethodAccessor2545.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:343)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:197)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
    at org.springframework.orm.hibernate5.support.OpenSessionInterceptor.invoke(OpenSessionInterceptor.java:90)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
    at com.sun.proxy.$Proxy249.chainStarted(Unknown Source)
    at com.atlassian.bamboo.chains.ChainExecutionManagerImpl.tryStartChainState(ChainExecutionManagerImpl.java:345)
    at com.atlassian.bamboo.chains.ChainExecutionManagerImpl.start(ChainExecutionManagerImpl.java:231)
    at sun.reflect.GeneratedMethodAccessor2541.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:343)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:197)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
    at com.sun.proxy.$Proxy235.start(Unknown Source)
    at sun.reflect.GeneratedMethodAccessor2541.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:343)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:206)
    at com.sun.proxy.$Proxy235.start(Unknown Source)
    at com.atlassian.bamboo.plan.PlanExecutionManagerImpl$3$2.call(PlanExecutionManagerImpl.java:456)
    at com.atlassian.bamboo.plan.PlanExecutionManagerImpl$3$2.call(PlanExecutionManagerImpl.java:451)
    at io.atlassian.util.concurrent.ManagedLocks$ManagedLockImpl.withLock(ManagedLocks.java:293)
    at com.atlassian.bamboo.plan.PlanExecutionLockServiceImpl.inlineProcessLocks(PlanExecutionLockServiceImpl.java:89)
    at com.atlassian.bamboo.plan.PlanExecutionManagerImpl.doWithInlineProcessLock(PlanExecutionManagerImpl.java:620)
    at com.atlassian.bamboo.plan.PlanExecutionManagerImpl.access$700(PlanExecutionManagerImpl.java:131)
    at com.atlassian.bamboo.plan.PlanExecutionManagerImpl$3.call(PlanExecutionManagerImpl.java:451)
    at com.atlassian.bamboo.plan.PlanExecutionManagerImpl$3.call(PlanExecutionManagerImpl.java:436)
    at io.atlassian.util.concurrent.ManagedLocks$ManagedLockImpl.withLock(ManagedLocks.java:293)
    at com.atlassian.bamboo.plan.PlanExecutionLockServiceImpl.lock(PlanExecutionLockServiceImpl.java:75)
    at com.atlassian.bamboo.plan.PlanExecutionManagerImpl.doWithProcessLock(PlanExecutionManagerImpl.java:652)
    at com.atlassian.bamboo.plan.PlanExecutionManagerImpl.startConditionalBuild(PlanExecutionManagerImpl.java:436)
    at com.atlassian.bamboo.plan.PlanExecutionManagerImpl.start(PlanExecutionManagerImpl.java:488)
    at com.atlassian.bamboo.plan.PlanExecutionManagerImpl.start(PlanExecutionManagerImpl.java:501)
    at com.atlassian.bamboo.plan.DelegatingPlanExecutionManager.start(DelegatingPlanExecutionManager.java:79)
    at com.atlassian.bamboo.plan.NonBlockingPlanExecutionServiceImpl$4.startPlanExecution(NonBlockingPlanExecutionServiceImpl.java:198)
    at com.atlassian.bamboo.plan.NonBlockingPlanExecutionServiceImpl$4.lambda$call$0(NonBlockingPlanExecutionServiceImpl.java:188)
    at com.atlassian.bamboo.util.CacheAwareness.lambda$withValuesOlderThanTimestampReloaded$1(CacheAwareness.java:101)
    at com.atlassian.bamboo.util.CacheAwareness.withValuesOlderThanTimestampReloaded(CacheAwareness.java:126)
    at com.atlassian.bamboo.util.CacheAwareness.withValuesOlderThanTimestampReloaded(CacheAwareness.java:100)
    at com.atlassian.bamboo.util.CacheAwareness.withValuesOlderThanTimestampReloaded(CacheAwareness.java:151)
    at com.atlassian.bamboo.plan.NonBlockingPlanExecutionServiceImpl$4.call(NonBlockingPlanExecutionServiceImpl.java:187)
    at com.atlassian.bamboo.plan.NonBlockingPlanExecutionServiceImpl$4.call(NonBlockingPlanExecutionServiceImpl.java:171)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at com.atlassian.bamboo.utils.BambooRunnables$1.run(BambooRunnables.java:48)
    at com.atlassian.bamboo.security.ImpersonationHelper.runWith(ImpersonationHelper.java:26)
    at com.atlassian.bamboo.security.ImpersonationHelper.runWithSystemAuthority(ImpersonationHelper.java:17)
    at com.atlassian.bamboo.security.ImpersonationHelper$1.run(ImpersonationHelper.java:41)
    at java.lang.Thread.run(Thread.java:748)
Plugin Version: 7.4.1 Bamboo Version: 6.10.6
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