Return undefined when the key is not present.

dist/plyr.js

@@ -1301,9 +1301,9 @@ var utils = {
 
 
     // Get a nested value in an object
-    getDeep: function getDeep(object, value) {
-        return value.split('.').reduce(function (obj, key) {
-            return obj[key] || {};
+    getDeep: function getDeep(object, path) {
+        return path.split('.').reduce(function (obj, key) {
+            return obj && obj[key] || undefined;
         }, object);
     },
 

dist/plyr.polyfilled.js

@@ -6690,9 +6690,9 @@ var utils = {
 
 
     // Get a nested value in an object
-    getDeep: function getDeep(object, value) {
-        return value.split('.').reduce(function (obj, key) {
-            return obj[key] || {};
+    getDeep: function getDeep(object, path) {
+        return path.split('.').reduce(function (obj, key) {
+            return obj && obj[key] || undefined;
         }, object);
     },
 

src/js/utils.js

@@ -729,8 +729,8 @@ const utils = {
     },
 
     // Get a nested value in an object
-    getDeep(object, value) {
-        return value.split('.').reduce((obj, key) => obj[key] || {}, object);
+    getDeep(object, path) {
+        return path.split('.').reduce((obj, key) => (obj && obj[key]) || undefined, object);
     },
 
     // Get the closest value in an array