Fixing issue with calling cancel after response has been received

lib/adapters/http.js

@@ -188,6 +188,10 @@ module.exports = function httpAdapter(config) {
     if (config.cancelToken) {
       // Handle cancellation
       config.cancelToken.promise.then(function onCanceled(cancel) {
+        if (aborted) {
+          return;
+        }
+
         req.abort();
         reject(cancel);
         aborted = true;

lib/adapters/xhr.js

@@ -156,6 +156,10 @@ module.exports = function xhrAdapter(config) {
     if (config.cancelToken) {
       // Handle cancellation
       config.cancelToken.promise.then(function onCanceled(cancel) {
+        if (!request) {
+          return;
+        }
+
         request.abort();
         reject(cancel);
         // Clean up request