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java.lang.NullPointerException: Cannot invoke "java.awt.dnd.DropTarget.getFlavorMap ...

java.lang.NullPointerException: Cannot invoke "java.awt.dnd.DropTarget.getFlavorMap()" because "this.currentDT" is null at java.desktop/sun.awt.dnd ...
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[Bug]: java.lang.NullPointerException: Cannot invoke "java.util.Map.keySet()"

Caused by: java.lang.NullPointerException: Cannot invoke "java.util.Map.keySet()" because the return value of "io.swagger.v3.oas.models.media.Discriminator.getMapping ...