This exception has no message.

Stack trace

java.lang.NullPointerException
	at org.wso2.carbon.apimgt.gateway.handlers.throttling.ThrottleHandler.doRoleBasedAccessThrottlingWithCEP(ThrottleHandler.java:197)
	at org.wso2.carbon.apimgt.gateway.handlers.throttling.ThrottleHandler.doThrottle(ThrottleHandler.java:497)
	at org.wso2.carbon.apimgt.gateway.handlers.throttling.ThrottleHandler.handleRequest(ThrottleHandler.java:445)
	at org.apache.synapse.rest.API.process(API.java:325)
	at org.apache.synapse.rest.RESTRequestHandler.dispatchToAPI(RESTRequestHandler.java:90)
	at org.apache.synapse.rest.RESTRequestHandler.process(RESTRequestHandler.java:69)
	at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2SynapseEnvironment.java:300)
	at org.apache.synapse.core.axis2.SynapseMessageReceiver.receive(SynapseMessageReceiver.java:75)
	at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
	at org.apache.synapse.transport.passthru.ServerWorker.processNonEntityEnclosingRESTHandler(ServerWorker.java:319)
	at org.apache.synapse.transport.passthru.ServerWorker.run(ServerWorker.java:152)
	at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)