wp_get_attachment_image_src returns false | WordPress.org

Hi to everyone.
Is a lot of time then I search to solve this issue, without results.
I need to get the image URL in the post.
I use this code:
$Thumbnail = wp_get_attachment_image_src( get_post_thumbnail_id ($post->ID), 'full' );
and $Thumbnail[0] returns nothing.
I wonder why, I tried several options, but this should be correct to get the image URL, what I’m searching to do.
The issue is in the Pinterest button: &media= nothing.

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