Enterprise Manager (EM) throws with java.lang.NullPointerException after clicking oim(11.1.2.0.0)

if you launch Enterprise Manager (EM) & click on "Identity and Access" -> OIM -> oim(11.1.2.0.0) and see the following error occur:

ERROR

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java.lang.NullPointerException at  oracle.sysman.emas.model.iam.oim.OIMHomeModel.fetchEventsHandlerData(OIMHomeModel.java:166) at oracle.sysman.emas.model.iam.oim.OIMHomeModel.initializeData(OIMHomeModel.java:86) at oracle.sysman.core.model.util.ModelUtil$EMObjectResetter.initOrResetEMObject(ModelUtil.java:319)

then, download and apply  patch 17375780 for Enterprise Manager (EM) 11.1.1.6.0