Delete button is not clickable

[lamtranb]

Expected Behavior

I can delete the image as normal.

Actual Behavior

No ajax call,

Steps to Reproduce the Problem

1. Click on an Image
2. Click delete icon (trash)

Specifications

I checked with the commit: 423f1ada88301a45040b1025f2c3e96f787c5889 (In my production server) and everything is working fine. But when I use dev-master, or 2.9.0 then it did not work. Please note that other buttons are working fine, except delete button.