diff --git a/rest_framework_simplejwt/serializers.py b/rest_framework_simplejwt/serializers.py
index e75e709c9..515f9a14d 100644
--- a/rest_framework_simplejwt/serializers.py
+++ b/rest_framework_simplejwt/serializers.py
@@ -53,6 +53,10 @@ def validate(self, attrs: Dict[str, Any]) -> Dict[Any, Any]:
 
         self.user = authenticate(**authenticate_kwargs)
 
+        if not user:
+            msg = _("Unable to log in with provided credentials.")
+            raise serializers.ValidationError(msg, code="authorization")
+
         if not api_settings.USER_AUTHENTICATION_RULE(self.user):
             raise exceptions.AuthenticationFailed(
                 self.error_messages["no_active_account"],