Let's look at this: if(jQuery.isEmptyObject(content))

What is inside the variable content when you pass it to the showInfo() function via the addMarker() function?

It's always a long string full of html code, right? Even if the response from $.getJSON inside addMarker() was an empty.

So this if(jQuery.isEmptyObject(content)) part won't ever work as you intend, because content is not a JavaScript empty object, but just a long string always full of html.

Look at jQuery.isEmptyObject() documentation: [![enter image description here][1]][1]

Now try to call $.isPlainObject on content to see what's the output. I'm sure it won't return true.

Maybe you should check if $.getJSON returned any links inside the addMarker() function, and if there are no links you set content to be what you want to be before you pass it to showInfo(). [1]: https://i.sstatic.net/cssId.jpg

Let's look at this: if(jQuery.isEmptyObject(content))

What is inside the variable content when you pass it to the showInfo() function via the addMarker() function?

It's always a long string full of html code, right? Even if the response from $.getJSON inside addMarker() was an empty.

So this if(jQuery.isEmptyObject(content)) part won't ever work as you intend, because content is not a JavaScript empty object, but just a long string always full of html.

Look at jQuery.isEmptyObject() documentation:

Now try to call $.isPlainObject on content to see what's the output. I'm sure it won't return true.

Maybe you should check if $.getJSON returned any links inside the addMarker() function, and if there are no links you set content to be what you want to be before you pass it to showInfo().