switch instructions can jump multiple times to the same place

src/main/java/net/runelite/deob/attributes/code/Instruction.java

@@ -221,6 +221,10 @@ public abstract class Instruction implements Cloneable
 		assert to != null;
 		assert to != this;
 		
+		assert this.jump.contains(to) == to.from.contains(this);
+		if (this.jump.contains(to))
+			return; // switch statements can jump to the same place multiple times
+
 		this.jump.add(to);
 		to.from.add(this);
 	}