diff --git a/models/api/finstitutions/payments/request.py b/models/api/finstitutions/payments/request.py
index 8ac8f70..9c2256b 100644
--- a/models/api/finstitutions/payments/request.py
+++ b/models/api/finstitutions/payments/request.py
@@ -246,7 +246,9 @@ class PGPaymentRequestData(BaseModel):
 
     @field_validator("description", mode = "before")
     def ensure_description(cls, value):
-        if value is None: value = "rndm_" + "".join(random.choices(string.ascii_letters + string.digits, k = 20))
+        if not isinstance(value, str):
+            value = "rndm_" + "".join(random.choices(string.ascii_letters + string.digits, k = 20))
+        return value
 
     @field_validator("tags", mode = "after")
     def null_to_empty_list(cls, value):