Custom Instrumentation is failing in Appdynamics Nodejs agent

Hi,

Custom instrumentation transaction detection is not working properly in nodejs agent (v4.1.7), the java proxy agent throws an exception when a custom rule is matched.

The rule is pretty simple: URI starts with

Controler version: 4.1.8

The exception is: 

com.appdynamics.ee.agent.proxy.AgentProxyService.getTransaction(AgentProxyService.java:1095)
com.appdynamics.ee.agent.proxy.AgentProxyService.getOrCreateTransaction(AgentProxyService.java:959)
com.appdynamics.ee.agent.proxy.AgentProxyService.processBTDetails(AgentProxyService.java:202)
com.appdynamics.ee.agent.proxy.z.run(z.java:199)
java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
java.lang.Thread.run(Unknown Source)

Any idea why the issue occurs?

Thanks.