Johann Heyne

Fix <a href="https://core.trac.wordpress.org/ticket/12061" rel="nofollow ugc">known issues</a> when shortcodes are embedded in a block of content that is filtered by wpautop.
<h4>for Theme Developers</h4>
If you are developing a theme to provide this on a marketplace, you better embed the following code in your functions.php. This code filters only the shortcodes you defined. Otherwise you risk a failed review because the code in the plugin filters content in general which may is not acceptet.
<pre><code>function shortcode_empty_paragraph_fix( $content ) {

 // define your shortcodes to filter, '' filters all shortcodes
 $shortcodes = array( 'your_shortcode_1', 'your_shortcode_2' );

 foreach ( $shortcodes as $shortcode ) {

 $array = array (
 '[' . $shortcode => '[' .$shortcode,
 '[/' . $shortcode => '[/' .$shortcode,
 $shortcode . ']' => $shortcode . ']',
 $shortcode . '] ' => $shortcode . ']'
 );

 $content = strtr( $content, $array );
 }

 return $content;
}

add_filter( 'the_content', 'shortcode_empty_paragraph_fix' );
</code></pre>
Another solution that is acceptet at the envato (themeforest) marketplace comes from <a href="https://gist.github.com/bitfade/4555047" title="a Gist on Github" rel="nofollow ugc">bitfade</a>.

Shortcode Empty Paragraph Fix

The standalone function work great , thank you

It's work

This simply plugin resolve the issue in mine.
I added the function and filter to my own plugin if it did not already exist.


Thanks! It solves my issue

Fix known issues when shortcodes are embedded in a block of content that is filtered by wpautop.

Stefan Kittel

It easily solves the problem of mixed unsafe content.
Once a web page has its contents, such as CSS, JavaScript or graphics loads unencrypted, the browser reports the whole website as unsafe.
This message will appear with this or similar texts “Connection is not secure” and “Parts of this page are not secure. This can e.g. be graphics. “.
Now you can check and correct all posts, comments, plugins and the theme …
Or you simply install “SSL Fixit”. 
Finished. There is nothing to configure.
The plugin simply replaces all http: // in the output with https: //.
However, if you still need unencrypted links, you can not use this plugin. 
But that should / should be there in the meantime only in exceptional cases.

SSL Fixit Plugin for WordPress by Stefan Kittel

A simple plugin to fix the html unsecure mixed content error

Shortcode Empty Paragraph Fix vs SSL Fixit Plugin for WordPress by Stefan Kittel