Check for null in UpgradeInventory#saveChanges. Fixes #3159
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@ -144,7 +144,10 @@ public abstract class UpgradeInventory extends AppEngInternalInventory implement
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@Override
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public void saveChanges()
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{
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this.parent.saveChanges();
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if( this.parent != null )
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{
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this.parent.saveChanges();
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}
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}
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@Override
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