If you right click with mouse in the filters area (in the free space around the filters), that causes “Uncaught TypeError: Cannot read property ‘attr’ of null” in browser console (tested in 2.4 and 2.6 versions).
You can try in this fiddle after having shown console in developper’s tools (Ctrl+Shift+I):
Uncaught TypeError: Cannot read property ‘attr’ of null
at U4c.I6c.Hy (flexmonster.js:9)
at J0D.yM (flexmonster.js:9)
at J0D.s2k.z4 (flexmonster.js:9)
at HTMLDocument.<anonymous> (flexmonster.js:9)
Thank you for writing. We have managed to reproduce the issue on our side.
The necessary fix will be added to the minor release on ETA Jan02.
We will notify you about the update.
Notification isn’t necessary.