Can you give a full URL example ?

There is no need for a full URL, since the quotes are removed when are in the field. Just enter >abc "'< and you get >abc<.

I recognized the error, when I was using a complete URL with EMcode.
Same behaviour. The last 2.05+ and 2.06+ show no difference.

Are you not able to reproduce?

The quotes could be removed because it is not a valid expression or not a valid URL. So I would appreciate a full URL example.

https://HOSTwithScript?lsn={SAVEDID}&test={if(q01_A1.NAOK == "Y", 1, 0)}

Workaround without quotes:
https://HOSTwithScript?lsn={SAVEDID}&test={if(!is_empty(q03_A1.NAOK),1,0)}

When using "Y" the quotes are removed and and QA is only having one warning.
Y unknown Variable since quotes are missing.

Question is, why a automatically working filter of quotes is needed at all. The QA check shows most of the errors nicely.

Fix committed to master branch: http://bugs.limesurvey.org/plugin.php?page=Source/view&id=15780

Fix committed to develop branch: http://bugs.limesurvey.org/plugin.php?page=Source/view&id=15781

Version 2.06+ Build 150930 released