Error 500 when message to another user

[fharsanto]

Version:
Openfire 4.1.3
ChatApi 0.0.2

end point /rest/api/restapi/v1/chat/messages/AnotherUser

curl command:
curl -X POST --header 'Content-Type: application/json' --header 'Authorization: Basic key' -d 'bla bla' 'http://domain:7070/rest/api/restapi/v1/chat/messages/AnotherUser'
Error log:

2017.03.16 01:54:05 org.jivesoftware.openfire.plugin.rest.RestEventSourceServlet - sendChatMessage 
java.lang.NullPointerException 
at org.jivesoftware.openfire.plugin.rest.RestEventSourceServlet.sendChatMessage(RestEventSourceServlet.java:238) 
at org.jivesoftware.openfire.plugin.rest.service.ChatService.postMessage(ChatService.java:146) 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
at java.lang.reflect.Method.invoke(Method.java:498) 
at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60) 
at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:205) 
at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75) 
at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302) 
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147) 
at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108) 
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147) 
at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84) 
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1542) 
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1473) 
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419) 
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409) 
at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409) 
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:540) 
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:715) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) 
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812) 
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:587) 
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) 
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:542) 
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223) 
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127) 
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515) 
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185) 
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061) 
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) 
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:215) 
at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:110) 
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97) 
at org.eclipse.jetty.server.Server.handle(Server.java:499) 
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311) 
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257) 
at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544) 
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635) 
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555) 
at java.lang.Thread.run(Thread.java:745)