Steps to reproduce the issue

https://user-images.githubusercontent.com/400092/113942022-17170400-97f8-11eb-88a3-f4164ed1eccc.png

Download this broken image and place in your /images folder as broken.png

Set error reporting to maximum in Joomla global config

Visit media manager in the backend.

Expected result

Media Manager works

Actual result

Ajax call has warning:

<br/>
<b>Notice</b>
:  exif_imagetype(): Error reading from /application/images/broken.png! in 
<b>/application/libraries/src/Helper/MediaHelper.php</b>
 on line 
<b>74</b>
<br/>
<br/>
<b>Notice</b>
:  getimagesize(): Error reading from /application/images/broken.png! in 
<b>/application/libraries/src/Image/Image.php</b>
 on line 
<b>185</b>
<br/>

System information (as much as possible)

Additional comments