TemplateException in ViewChainResult.getAgent(long)

2013-08-15 22:53:08,509 ERROR [qtp717881621-1481] [runtime] Method public com.atlassian.bamboo.v2.build.agent.BuildAgent com.atlassian.bamboo.ww2.actions.chains.ViewChainResult.getAgent(long) threw an exception when invoked on com.atlassian.bamboo.ww2.actions.chains.ViewChainResult@3d451476

Method public com.atlassian.bamboo.v2.build.agent.BuildAgent com.atlassian.bamboo.ww2.actions.chains.ViewChainResult.getAgent(long) threw an exception when invoked on com.atlassian.bamboo.ww2.actions.chains.ViewChainResult@3d451476
The problematic instruction:
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==> assignment: agent=action.getAgent(jobSummary.buildAgentId)! [on line 34, column 21 in chain/view/viewChainResult.ftl]
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Java backtrace for programmers:
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freemarker.template.TemplateModelException: Method public com.atlassian.bamboo.v2.build.agent.BuildAgent com.atlassian.bamboo.ww2.actions.chains.ViewChainResult.getAgent(long) threw an exception when invoked on com.atlassian.bamboo.ww2.actions.chains.ViewChainResult@3d451476
	at freemarker.ext.beans.SimpleMethodModel.exec(SimpleMethodModel.java:130)
	at freemarker.core.MethodCall._getAsTemplateModel(MethodCall.java:104)
	at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
	at freemarker.core.DefaultToExpression._getAsTemplateModel(DefaultToExpression.java:100)
	at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
	at freemarker.core.Assignment.accept(Assignment.java:90)
	at freemarker.core.Environment.visit(Environment.java:210)
	at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:79)
	at freemarker.core.Environment.visit(Environment.java:210)
	at freemarker.core.MixedContent.accept(MixedContent.java:92)
	at freemarker.core.Environment.visit(Environment.java:210)
	at freemarker.core.IfBlock.accept(IfBlock.java:82)
	at freemarker.core.Environment.visit(Environment.java:210)
	at freemarker.core.MixedContent.accept(MixedContent.java:92)
	at freemarker.core.Environment.visit(Environment.java:210)
	at freemarker.core.IfBlock.accept(IfBlock.java:82)
	at freemarker.core.Environment.visit(Environment.java:210)
	at freemarker.core.MixedContent.accept(MixedContent.java:92)
	at freemarker.core.Environment.visit(Environment.java:210)
	at freemarker.core.Environment.process(Environment.java:190)