diff --git a/src/config/config.prod.js b/src/config/config.prod.js
index 3c66b78..2b58e43 100644
--- a/src/config/config.prod.js
+++ b/src/config/config.prod.js
@@ -5,9 +5,9 @@ module.exports = {
         constraints: {
             width: 640,
             height: 480,
-            minAspectRatio: 0,
-            maxAspectRatio: 100,
-            facing: "environment" // or user
+            // aspectRatio: 640/480, // optional
+            facingMode: "environment", // or user
+            // deviceId: "38745983457387598375983759834"
         },
         area: {
             top: "0%",
diff --git a/src/quagga.js b/src/quagga.js
index 7843641..29bc4a0 100644
--- a/src/quagga.js
+++ b/src/quagga.js
@@ -520,9 +520,9 @@ export default {
                 halfSample: false
             }
         }, config);
-        this.init(config, function() {
-            Events.once("processed", function(result) {
-                _stopped = true;
+        this.init(config, () => {
+            Events.once("processed", (result) => {
+                this.stop();
                 resultCallback.call(null, result);
             }, true);
             start();