Blank page when reapproving

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      Hi, i'm running with Jenkins 1.559 and promoted builds plugin 2.17.
      In a job with a promotion process defined with a manual approval, the first execution of the promotion on a build (by clicking 'approve' button) is successful, but the next ones (by clicking on 'Re-execute promotion' button) return a blank http page, and produces this exception in Jenkins log:

       
Error while serving http://ci-server/jenkins/job/test_promotion_1/descriptorByName/org.jenkinsci.plugins.ghprb.GhprbTrigger/checkCron
java.lang.reflect.InvocationTargetException
	at sun.reflect.GeneratedMethodAccessor1135.invoke(Unknown Source)
(snip)	
Caused by: java.lang.NoSuchMethodError: hudson.triggers.TimerTrigger$DescriptorImpl.doCheckSpec(Ljava/lang/String;)Lhudson/util/FormValidation;
	at org.jenkinsci.plugins.ghprb.GhprbTrigger$DescriptorImpl.doCheckCron(GhprbTrigger.java:349)

      The problem is not reproducible when i use an admin user.

            Assignee:
            Unassigned
            Reporter:
            Maxime Lemanissier
            Archiver:
            Jenkins Service Account

              Created:
              Updated:
              Archived: