NPE in the Last Chain - Chain of Responsibility Design Pattern [closed] - java

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Im getting NPE in the Last Chain
How to handle the next chain in dispense() of the last chain
do we need to intentionally skip the chain.dispense() in the last chain?
what will be nextchain value for the last chain ?
Code : https://github.com/programmerarunkumar/DesignPattern/tree/ChainOfResponsibility/src/BehaviourPattern/ChainOfResponsibility

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