If I try to save a product version, it fails with a big red error.

Looking in the error log then it seems to be this query which fails:

select count(*) as cpt from version where idProduct=1 and versionNumber='1.0' and id!=-1

I've highlighted the part which fails in bold

which is at line 458 in the file /model/Version.php:458

If I amend the code to put a space between the = and - then it work successfully

select count(*) as cpt from version where idProduct=1 and versionNumber='1.0' and id!= -1