AppleScript Property for Mail not found with Catalina

Hello,

i have some script which reads the active email adresses from apple mail. The code looks like this:

set text item delimiters to ";"
tell application "Mail"
  set email_accounts to {}
  repeat with acc in accounts
  set emailAdresses to (email addresses of acc) as rich text
  if enabled of acc then
  set end of email_accounts to (id of acc) & ":" & emailAdresses
  end if
  end repeat
  email_accounts
end tell

This versions runs until catalina without a problem. Now it looks like "enabled of acc" which means the property Enabled of an email account couldn't found any more.

The failure is

error "Mail got an error: AppleEvent handler failed." number -10000

How could this be fixed ?