Generating a Bamboo report (e.g. Clover summary), for a build with manual stages or RSS build, hangs and throws: Null 'key' argument

Version: 5.10.2
Build: 51019
Build Date: 01 Mar 2016
Request information:
Request URL: https://bamboo.example.com:8443/chain/viewCloverSummary.action
Scheme: https
Server: bamboo.example.com
Port: 8443
URI: /chain/viewCloverSummary.action
Context path:
Servlet path: /chain/viewCloverSummary.action
Path info:
Query string: buildKey=PROJ-PLAN
Stack Trace:

java.lang.IllegalArgumentException: Null 'key' argument.
	at org.jfree.data.DefaultKeyedValues2D.getRowIndex(DefaultKeyedValues2D.java:184)
	at org.jfree.data.DefaultKeyedValues2D.setValue(DefaultKeyedValues2D.java:321)
	at org.jfree.data.DefaultKeyedValues2D.addValue(DefaultKeyedValues2D.java:304)
	at org.jfree.data.time.TimeTableXYDataset.add(TimeTableXYDataset.java:219)
	at com.atlassian.bamboo.reports.collector.AbstractTimePeriodCollector.writeCollaterToDataSet(AbstractTimePeriodCollector.java:202)
	at com.atlassian.bamboo.reports.collector.AbstractTimePeriodCollector.getDataset(AbstractTimePeriodCollector.java:83)
	at com.atlassian.bamboo.clover.build.coverage.ViewCloverCoverageSummary.run(ViewCloverCoverageSummary.java:74)
	at com.atlassian.bamboo.clover.build.coverage.ViewCloverCoverageSummary.execute(ViewCloverCoverageSummary.java:61)
	at sun.reflect.GeneratedMethodAccessor1608.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:450)