Avoiding email template save error

I get this message pretty sporadically in email templates…
At first I saw the pattern of it happening when there was no subject line… but that’s not the case now.
Anyone have tips for avoiding this error?

I get this message pretty sporadically in email templates…
At first I saw the pattern of it happening when there was no subject line… but that’s not the case now.
Anyone have tips for avoiding this error?
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