Fix NPM driver

src/drivers/npm/driver.js

@@ -61,7 +61,12 @@ const driver = {
       browser.visit(url, error => {
         wappalyzer.driver.document = browser.document;
 
-        const headers = browser.resources['0'].response.headers;
+        const headers = {};
+
+        browser.resources['0'].response.headers._headers.forEach(header => {
+          headers[header[0]] = header[1];
+        });
+
         const vars = Object.getOwnPropertyNames(browser.window);
         const html = browser.html();
 

src/wappalyzer.js

@@ -296,10 +296,6 @@ class Wappalyzer {
    * Cache detected applications
    */
   cacheDetectedApps(apps, url) {
-    if ( !( this.driver.ping instanceof Function ) ) {
-      return;
-    }
-
     Object.keys(apps).forEach(appName => {
       var app = apps[appName];
 
@@ -311,7 +307,9 @@ class Wappalyzer {
       });
     })
 
-    this.ping();
+    if ( this.driver.ping instanceof Function ) {
+      this.ping();
+    }
   }
 
   /**