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When ServiceBusSessionReceiverAsyncClient throws an IllegalStateException while closing, it means that the receiver client is in an invalid state that does not allow it to be closed properly. This can happen when the client is already closed or when an operation is still in progress that prevents the client from being closed.

In order to resolve this issue, you should make sure to check the client's state before attempting to close it, and ensure that all pending operations have completed before closing the client. You may also need to handle any exceptions that may be thrown during the close operation, in order to gracefully handle any errors that may occur.