error-reporting: Address unresponsive Hapi apps

packages/error-reporting/src/interfaces/hapi.js

@@ -92,7 +92,7 @@ function makeHapiPlugin(client, config) {
             client.sendError(em);
           }
 
-          if (isObject(reply) && isFunction(reply.continue)) {
+          if (reply && isFunction(reply.continue)) {
             reply.continue();
           }
         });

packages/error-reporting/test/unit/interfaces/hapi.js

@@ -113,16 +113,32 @@ describe('Hapi interface', function() {
     afterEach(function() {
       fakeServer.removeAllListeners();
     });
-    it('Should call continue when a boom is emitted', function(done) {
-      plugin.register(fakeServer, null, function() {});
-      fakeServer.emit(EVENT, {response: {isBoom: true}},
-        {
-          continue: function() {
-            // The continue function should be called
-            done();
+    it('Should call continue when a boom is emitted if reply is an object',
+      function(done) {
+        plugin.register(fakeServer, null, function() {});
+        fakeServer.emit(EVENT, {response: {isBoom: true}},
+          {
+            continue: function() {
+              // The continue function should be called
+              done();
+            }
           }
-        }
-     );
+       );
+    });
+    it('Should call continue when a boom is emitted if reply is a function',
+      function(done) {
+        // Manually testing has shown that in actual usage the `reply` object
+        // provided to listeners of the `onPreResponse` event can be a function
+        // that has a `continue` property that is a function.
+        // If `reply.continue()` is not invoked in this situation, the Hapi
+        // app will become unresponsive.
+        plugin.register(fakeServer, null, function() {});
+        var reply = function() {};
+        reply.continue = function() {
+          // The continue function should be called
+          done();
+        };
+        fakeServer.emit(EVENT, {response: {isBoom: true}}, reply);
     });
     it('Should call sendError when a boom is received', function(done) {
       var fakeClient = {