Caused by: java.lang.IllegalStateException: Duplicate key CategoryOrderEntity{id=934}
        at java.util.stream.Collectors.lambda$throwingMerger$0(Collectors.java:133) ~[?:1.8.0_77]
        at java.util.HashMap.merge(HashMap.java:1245) ~[?:1.8.0_77]
        at java.util.stream.Collectors.lambda$toMap$58(Collectors.java:1320) ~[?:1.8.0_77]
        at java.util.stream.ReduceOps$3ReducingSink.accept(ReduceOps.java:169) ~[?:1.8.0_77]
        at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175) ~[?:1.8.0_77]
        at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1374) ~[?:1.8.0_77]
        at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481) ~[?:1.8.0_77]
        at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) ~[?:1.8.0_77]
        at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) ~[?:1.8.0_77]
        at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:1.8.0_77]
        at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499) ~[?:1.8.0_77]
        at com.smart_tab.venue.category.order.c.a(SourceFile:33) ~[SmartTAB-jfx.jar:?]
        at com.smart_tab.venue.category.order.e.a(SourceFile:28) ~[SmartTAB-jfx.jar:?]
        at com.smart_tab.venue.category.order.d.a(SourceFile:25) ~[SmartTAB-jfx.jar:?]
        at com.smart_tab.ui.orderproducts.tabbedpages.menupage.MenuPageController.a(SourceFile:286) ~[SmartTAB-jfx.jar:?]
        at io.reactivex.internal.operators.observable.ObservableMap$MapObserver.onNext(ObservableMap.java:59) ~[rxjava-2.0.6.jar:2.0.6]
        at io.reactivex.internal.operators.observable.ObservableObserveOn$ObserveOnObserver.drainNormal(ObservableObserveOn.java:200) ~[rxjava-2.0.6.jar:2.0.6]
        at io.reactivex.internal.operators.observable.ObservableObserveOn$ObserveOnObserver.run(ObservableObserveOn.java:252) ~[rxjava-2.0.6.jar:2.0.6]
        at io.reactivex.internal.schedulers.ScheduledRunnable.run(ScheduledRunnable.java:59) ~[rxjava-2.0.6.jar:2.0.6]
        at io.reactivex.internal.schedulers.ScheduledRunnable.call(ScheduledRunnable.java:51) ~[rxjava-2.0.6.jar:2.0.6]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_77]
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) ~[?:1.8.0_77]
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) ~[?:1.8.0_77]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[?:1.8.0_77]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[?:1.8.0_77]
        ... 1 more