java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.wso2.carbon.apimgt.usage.publisher.APIMgtUsageDataBridgeDataPublisher.publishEvent(APIMgtUsageDataBridgeDataPublisher.java:124)
at org.wso2.carbon.apimgt.usage.publisher.APIMgtUsageHandler.handleRequest(APIMgtUsageHandler.java:169)
at org.apache.synapse.rest.API.process(API.java:322)
at org.apache.synapse.rest.RESTRequestHandler.dispatchToAPI(RESTRequestHandler.java:86)
at org.apache.synapse.rest.RESTRequestHandler.process(RESTRequestHandler.java:65)
at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2SynapseEnvironment.java:295)
at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
at org.apache.synapse.transport.passthru.ServerWorker.processNonEntityEnclosingRESTHandler(ServerWorker.java:317)
at org.apache.synapse.transport.passthru.ServerWorker.run(ServerWorker.java:149)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)

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