OSX Sierra
safari Version 10.0.3 (12602.4.8)
This is reproducible on safari on the homepage editor: https://www.froala.com/wysiwyg-editor
If you attach event handlers in the console:
$('#froala-editor').on('froalaEditor.paste.afterCleanup', (e,editor,clipboard_html)=> console.log(clipboard_html));
And copy something from within the editor (or another safari tab) and paste it in the editor. The paste.afterCleanup is fired twice, once with the clipboard_html set to Event(..) and the second time with the actual html:

still happening with version 2.7.3, In Chrome - sometimes clipboard_html have event instead of "clipboard_html"
@stefanneculai
@pawansingh-snapwiz could you please use this basic jsFiddle to highlight the problem? Thank you in advance.
Event gets fired twice when pasting html based content. First time with jQuery event, second time with pasted html.
Event gets fired once with jQuery event when pasting image.
https://jsfiddle.net/rbf6n9yx/1/
Windows 10
Chrome 73.0.3683.103 (64 bits)
Firefox 66.0.3 (64 bits)
Most helpful comment
still happening with version 2.7.3, In Chrome - sometimes clipboard_html have event instead of "clipboard_html"
@stefanneculai