Error saving new content - line 2139 of /includes/database/database.inc

After upload the site to the server, i am getting this error after save new nodes with tablefield:

Recoverable fatal error: Object of class Point could not be converted to string em DatabaseStatementBase->execute() (line 2139 of MYSITE/includes/database/database.inc).

The table remains empty. Any help would be appreciated!

Thanks in advance!