Receiving null reference on an object - grails

Question

I'm having a slightly frustrating problem dealing with a service. As the title states, I'm getting a null reference error on an object when used as a parameter. When I check intelliJ using step-through functionality, there is an object with correct values being passed to each service/function. Am I missing something?
View :
<g:canAddSupervisor performanceReview="${performanceReview}">
do stuff...
</g:canAddSupervisor>
GateTagLib.groovy
class GateTagLib {
def canAddSupervisor = { attrs, body ->
Person viewer = springSecurityService.currentUser as Person
PerformanceReview review = attrs["performanceReview"]
if (performanceReviewShowGateService.canShowAddSupervisorButton(viewer, review)) {
out << body()
}
}
}
PerformanceReviewShowGateService.groovy
class PerformanceReviewShowGateService {
def performanceReviewStatusGateService
boolean canShowAddSupervisorButton(Person viewer, PerformanceReview review) {
if (!performanceReviewStatusGateService.isStatusFinalizedOrComplete(review) && isViewerAdminOrHR(viewer)) {
true
} else {
false
}
}
PerformanceReviewStatusGateService.groovy
boolean isStatusFinalizedOrComplete(PerformanceReview review) {
def statusName = review.performanceReviewStatus.name
(statusName == "Finalized" || statusName == "Complete")
}
Stacktrace :
2014-01-10 15:19:58,018 [http-bio-8080-exec-7] ERROR errors.GrailsExceptionResolver - NullPointerException occurred when processing request: [GET] /PerformanceEvaluations/performanceReview/323
Cannot invoke method isStatusFinalizedOrComplete() on null object. Stacktrace follows:
org.codehaus.groovy.grails.web.pages.exceptions.GroovyPagesException: Error processing GroovyPageView: Error executing tag <g:render>: Error executing tag <g:canAddSupervisor>: Cannot invoke method isStatusFinalizedOrComplete() on null object
at grails.plugin.cache.web.filter.PageFragmentCachingFilter.doFilter(PageFragmentCachingFilter.java:195)
at grails.plugin.cache.web.filter.AbstractFilter.doFilter(AbstractFilter.java:63)
at net.bull.javamelody.JspWrapper.invoke(JspWrapper.java:117)
at net.bull.javamelody.JdbcWrapper$DelegatingInvocationHandler.invoke(JdbcWrapper.java:231)
at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:197)
at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:171)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
Caused by: org.codehaus.groovy.grails.web.taglib.exceptions.GrailsTagException: Error executing tag <g:render>: Error executing tag <g:canAddSupervisor>: Cannot invoke method isStatusFinalizedOrComplete() on null object
at C__Users_per245_PerformanceReview_grails_app_views_performanceReview_show_gsp$_run_closure2.doCall(show.gsp:37)
at C__Users_per245_PerformanceReview_grails_app_views_performanceReview_show_gsp.run(show.gsp:136)
... 9 more
Caused by: org.codehaus.groovy.grails.web.taglib.exceptions.GrailsTagException: Error executing tag <g:canAddSupervisor>: Cannot invoke method isStatusFinalizedOrComplete() on null object
at C__Users_per245_PerformanceReview_grails_app_views_performanceReview__evaluationListTemplate_gsp.run(_evaluationListTemplate.gsp:184)
... 11 more
Caused by: java.lang.NullPointerException: Cannot invoke method isStatusFinalizedOrComplete() on null object
at com.example.performanceevaluations.PerformanceReviewShowGateService$$EOSZwaTu.canShowAddSupervisorButton(PerformanceReviewShowGateService.groovy:71)
at com.example.performanceevaluations.GateTagLib$_closure6$$EOSZwaUW.doCall(GateTagLib.groovy:68)
... 12 more