Uncaught TypeError: Cannot read property ‘secret’ of null wp-embed.min.js

Solution:

Issue is with WordPress wp-embed.js . Change following following code/

if ( ! ( data.secret || data.message || data.value ) ) {
to

if ( ! data || ! ( data.secret || data.message || data.value ) ) {
On line 32. It should solve the issue. Refrence : https://core.trac.wordpress.org/ticket/44832