diff --git a/vendors/knockout/src/subscribables/observableArray.js b/vendors/knockout/src/subscribables/observableArray.js
index 592389c23..0f50e1c64 100644
--- a/vendors/knockout/src/subscribables/observableArray.js
+++ b/vendors/knockout/src/subscribables/observableArray.js
@@ -1,7 +1,7 @@
 ko['observableArray'] = initialValues => {
     initialValues = initialValues || [];
 
-    if (typeof initialValues != 'object' || !('length' in initialValues))
+    if (!Array.isArray(initialValues))
         throw new Error("The argument passed when initializing an observable array must be an array, or null, or undefined.");
 
     return Object.setPrototypeOf(ko.observable(initialValues), ko['observableArray']['fn']).extend({'trackArrayChanges':true});
diff --git a/vendors/knockout/src/templating/templating.js b/vendors/knockout/src/templating/templating.js
index 3f858fdd4..74eadb400 100644
--- a/vendors/knockout/src/templating/templating.js
+++ b/vendors/knockout/src/templating/templating.js
@@ -67,7 +67,7 @@
             var renderedNodesArray = renderTemplateSource(makeTemplateSource(template, templateDocument));
 
             // Loosely check result is an array of DOM nodes
-            if ((typeof renderedNodesArray.length != "number") || (renderedNodesArray.length > 0 && typeof renderedNodesArray[0].nodeType != "number"))
+            if (!Array.isArray(renderedNodesArray) || (renderedNodesArray.length > 0 && typeof renderedNodesArray[0].nodeType != "number"))
                 throw new Error("Template engine must return an array of DOM nodes");
 
             if (replaceChildren) {