[Fix] Check if updateTask is null in DefaultObserverHandler
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@ -74,7 +74,8 @@ public class DefaultObserverHandler implements ObserverHandler {
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@Override
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@Override
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public void stop() {
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public void stop() {
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this.run = false;
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this.run = false;
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this.updateTask.cancel(true);
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if (this.updateTask != null)
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this.updateTask.cancel(true);
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}
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}
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@Override
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@Override
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