Script saving returns empty script

I was working on a script.
I had sliders named slider 27, slider 28. Renamed them to slider 1, slider 2. Hoped the name in reaction that was using them will change their internal names too, from “slider 27 was moved” to “slider 1 was moved”. But that didn’t happened. I pressed Save script button, CSS didnt showed up a save confirm window. I pressed to save again. I have closed CSS.
CSS showed me an error of that script on next opening the CSS programm. And scipt file has 0 bytes weight now, so the file is completely empty. I had not exported it – so i have lost all the work i had done for several days.

Be carefull – export your sripts often, or make a backup.