Don't add fuel to the fire.

Related English Proverbs
To add insult to injury.

Meaning: One should not make a bad situation even worse by an improper remark.

Croatian
Na oganj ulja ne ljevaj.
Translation: One should not add oil to the fire.

German
Man soll kein Öl ins Feuer giessen.
Translation: One should not add oil to the fire.

Romanian
A pune sare pe rană.
Translation: To put salt on the wound.

lighten torch proverb about insultYiddish
.אויף פֿײַער זאָל מען קיין בוימל ניט גיסן
Translation:Don't pour oil on fire.