diff --git a/frappe/email/receive.py b/frappe/email/receive.py
index e5c8457b4e..9ba080bfda 100644
--- a/frappe/email/receive.py
+++ b/frappe/email/receive.py
@@ -480,7 +480,7 @@ class Email:
 		"""Detect chartset."""
 		charset = part.get_content_charset()
 		if not charset:
-			charset = chardet.detect(cstr(part))['encoding']
+			charset = chardet.detect(safe_encode(cstr(part)))['encoding']
 
 		return charset