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I am using magento2, porto theme

every time i load the checkout page, i get a javascript alert with the message below.

i did not change anything, it suddenly appeared, all i did was i added some labels in ko template such as: <strong>name</strong> <!-- ko text: address().firstname -->

and it was working fine, then after a while the strong tag disappeared and i started getting this JS alert. no idea if they are related.

The JS alert is the following:


function observable() {
if (arguments.length > 0) {
// Write

// Ignore writes if the value hasn't changed
if (observable.isDifferent(_latestValue, arguments[0])) {
_latestValue = arguments[0];
if (DEBUG) observable._latestValue = _latestValue;
return this; // Permits chained assignments
else {
// Read
ko.dependencyDetection.registerDependency(observable); // The caller only needs to be notified of changes if they did a "read" operation
return _latestValue;




Re: observable

Hi @eaad,


Are you getting the same error using the default theme (Luma)?

If you've found one of my answers useful, please give "Kudos" or "Accept as Solution"