Steps to reproduce the issue

Run Joomla on a host system with a non US locale, for example 'swedish'.
Create/Open an article and save it.

Expected result

Silently save article.

Actual result

com_finder will generate "Column count doesn't match value count at row 1" (Error Code: 1136.)

System information (as much as possible)

Database Version 5.5.55-cll
Database Collation latin1_swedish_ci
Database Connection Collation utf8mb4_general_ci
PHP Version 5.6.16
Web Server Apache
WebServer to PHP Interface cgi-fcgi
Joomla! Version Joomla! 3.7.3 Stable [ Amani ] 4-July-2017 08:03 GMT
Joomla! Platform Version Joomla Platform 13.1.0 Stable [ Curiosity ] 24-Apr-2013 00:00 GMT

Additional comments

Reason is that just casting a value to (float) will generate a locale aware floating-point number.
In Swedish ',' is used for decimal separation (3,14) and that will not work in an SQL statement.

com_finder_sql_float_cast.patch.txtApplied patch will at least fix the problem, might not be the perfect solution but it works for me :)