Linked repositories Usage generates error in the logs

2016-07-04 15:54:50,626 ERROR [http-nio-6990-exec-9] [runtime] Error executing FreeMarker template
FreeMarker template error:
The following has evaluated to null or missing:
==> action.getDeploymentProject  [in template "freemarker-lib/ui.ftl" at line 392, column 22]

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Tip: It's the step after the last dot that caused this error, not those before it.
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Tip: If the failing expression is known to be legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use [#if myOptionalVar??]when-present[#else]when-missing[/#if]. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
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FTL stack trace ("~" means nesting-related):
	- Failed at: #assign project = action.getDeploymen...  [in template "freemarker-lib/ui.ftl" in macro "renderEnvironmentNameLink" at line 392, column 5]
	- Reached through: @ui.renderEnvironmentNameLink environ...  [in template "build/common/repositoryCommon.ftl" in macro "viewGlobalRepositoryUsages" at line 176, column 17]
	- Reached through: @rc.viewGlobalRepositoryUsages planUs...  [in template "admin/repository/viewGlobalRepositoryUsages.ftl" at line 16, column 5]
	- Reached through: @ww.form id="viewRepositoryUsagesForm...  [in template "admin/repository/viewGlobalRepositoryUsages.ftl" at line 11, column 1]
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Java stack trace (for programmers):
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freemarker.core.InvalidReferenceException: [... Exception message was already printed; see it above ...]
	at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:134)
	at freemarker.core.UnexpectedTypeException.newDesciptionBuilder(UnexpectedTypeException.java:80)
	at freemarker.core.UnexpectedTypeException.<init>(UnexpectedTypeException.java:43)
	at freemarker.core.NonMethodException.<init>(NonMethodException.java:49)
	at freemarker.core.MethodCall._eval(MethodCall.java:97)
	at freemarker.core.Expression.eval(Expression.java:81)
	at freemarker.core.Assignment.accept(Assignment.java:134)
	at freemarker.core.Environment.visit(Environment.java:362)
	at freemarker.core.Environment.invoke(Environment.java:714)
	at freemarker.core.UnifiedCall.accept(UnifiedCall.java:86)
	at freemarker.core.Environment.visit(Environment.java:362)
	at freemarker.core.IteratorBlock$IterationContext.executeNestedContent(IteratorBlock.java:239)
	at freemarker.core.IteratorBlock$IterationContext.accept(IteratorBlock.java:200)
	at freemarker.core.Environment.visitIteratorBlock(Environment.java:595)
	at freemarker.core.IteratorBlock.acceptWithResult(IteratorBlock.java:81)
	at freemarker.core.IteratorBlock.accept(IteratorBlock.java:67)
	at freemarker.core.Environment.visit(Environment.java:326)
	at freemarker.core.Environment.visit(Environment.java:368)
	at freemarker.core.Environment.invoke(Environment.java:714)
	at freemarker.core.UnifiedCall.accept(UnifiedCall.java:86)
	at freemarker.core.Environment.visit(Environment.java:362)
	at freemarker.core.Environment.visitAndTransform(Environment.java:460)
	at freemarker.core.UnifiedCall.accept(UnifiedCall.java:129)
	at freemarker.core.Environment.visit(Environment.java:326)
	at freemarker.core.Environment.visit(Environment.java:332)
	at freemarker.core.Environment.process(Environment.java:305)
	at freemarker.template.Template.process(Template.java:384)
	at org.apache.struts2.views.freemarker.FreemarkerResult.doExecute(FreemarkerResult.java:233)
	at org.apache.struts2.result.StrutsResultSupport.execute(StrutsResultSupport.java:208)
	at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:366)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:270)