New/Modify email template

Good morning. Did either of you receive the same mistake by creating a new or modifying an old emails template? Warning : Invalid argument supplied for foreach() in /web/htdocs/ on line 74

Many thanks

This is just a warning message about some variables and it is not a fatal type error so It will not affect script execution. You can ignore this, it is showing you on screen because in your php.ini settings it is set as display_errors = on.
You can turn off by yourself or ask your hosting provider.