Description of the Issue

When you press Enter in the Find field in the Menu-Plugins-Plugins Admin menu, the "Plugins Admin" window closes.

Steps to Reproduce the Issue

1. Menu
2. Plugins
3. Plugins Admin
4. Find
5. Search query
6. Press Enter

Expected Behavior

The search for plugins should begin

Actual Behavior

The window "Plugins Admin" is close

Debug Information