Using ' character in alert message prevents product from working

I had problem making the product work and discovered that if I used a ' character in the alert message in prevents the tool from working, which is a pretty common character in french given that "copyright" translates to "Droits d'auteur".

After numerous test I am now sure that message length is not the issue, it is just the character ' .

" works fine as well as ` (which is my current work-around). Just tought I'll let you know