GBL's main search bar stops working immediately after making some small toolbar customization

[LL25255252]

Sometimes immediately after customizing the toolbars GBL's search bar stops working (a simple search ignores the search words and google search suggestions suddenly won't show up).
Tested on both a clean FF 52 ESR profile and a clean Basilisk 2018.04.24 profile.
After a browser restart everything is OK.

I succeeded to reproduce this bug at least 10 times.
Thanks in advance.

[LL25255252]

I have just noticed that a similar bug had been fixed in one of GBL's old version.
"Bug Fix: Corrected an issue that was causing the toolbar to shut down after toolbar customization."
https://addons.mozilla.org/en-US/firefox/addon/googlebar-lite/versions/4.9.1.1-signed