MercuryTrade randomly stops opening notifications

This has been happening for a good while, so I've opened it through the console.
Here is the output while notifications don't pop up.
`C:\Users\Peter>java -jar C:\Users\Peter\Documents\Takietam\PoE\MercuryTrade\MercuryTrade.jar

JNativeHook: Global keyboard and mouse hooking for Java.
Copyright (C) 2006-2015 Alexander Barker.  All Rights Received.
https://github.com/kwhat/jnativehook/

JNativeHook is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

JNativeHook is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

log4j:WARN No appenders could be found for logger (io.netty.util.internal.logging.InternalLoggerFactory).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
02:14:49.221 [Thread-7] ERROR ErrorHandler - rx.exceptions.OnErrorNotImplementedException
        at rx.internal.util.InternalObservableUtils$ErrorNotImplementedAction.call(InternalObservableUtils.java:386)
        at rx.internal.util.InternalObservableUtils$ErrorNotImplementedAction.call(InternalObservableUtils.java:383)
        at rx.internal.util.ActionSubscriber.onError(ActionSubscriber.java:44)
        at rx.observers.SafeSubscriber._onError(SafeSubscriber.java:153)
        at rx.observers.SafeSubscriber.onError(SafeSubscriber.java:115)
        at rx.exceptions.Exceptions.throwOrReport(Exceptions.java:216)
        at rx.observers.SafeSubscriber.onNext(SafeSubscriber.java:139)
        at rx.subjects.PublishSubject$PublishSubjectProducer.onNext(PublishSubject.java:304)
        at rx.subjects.PublishSubject$PublishSubjectState.onNext(PublishSubject.java:219)
        at rx.subjects.PublishSubject.onNext(PublishSubject.java:72)
        at com.mercury.platform.core.utils.interceptor.PlainMessageInterceptor.process(PlainMessageInterceptor.java:34)
        at com.mercury.platform.core.utils.interceptor.MessageInterceptor.match(MessageInterceptor.java:17)
        at com.mercury.platform.core.utils.MessageFileHandler.lambda$null$2(MessageFileHandler.java:86)
        at java.util.ArrayList.forEach(Unknown Source)
        at com.mercury.platform.core.utils.MessageFileHandler.lambda$parse$3(MessageFileHandler.java:85)
        at java.util.ArrayList.forEach(Unknown Source)
        at com.mercury.platform.core.utils.MessageFileHandler.parse(MessageFileHandler.java:84)
        at com.mercury.platform.core.utils.FileMonitor$1.onFileChange(FileMonitor.java:43)
        at org.apache.commons.io.monitor.FileAlterationObserver.doMatch(FileAlterationObserver.java:410)
        at org.apache.commons.io.monitor.FileAlterationObserver.checkAndNotify(FileAlterationObserver.java:333)
        at org.apache.commons.io.monitor.FileAlterationObserver.checkAndNotify(FileAlterationObserver.java:303)
        at org.apache.commons.io.monitor.FileAlterationMonitor.run(FileAlterationMonitor.java:182)
        at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
        at com.mercury.platform.ui.components.panel.notification.TradeOutNotificationPanel.lambda$subscribe$6(TradeOutNotificationPanel.java:81)
        at rx.internal.util.ActionSubscriber.onNext(ActionSubscriber.java:39)
        at rx.observers.SafeSubscriber.onNext(SafeSubscriber.java:134)
        ... 16 more

`
Exslims / MercuryTrade

MercuryTrade randomly stops opening notifications #220
