diff --git a/netflow/ipfix.py b/netflow/ipfix.py
index 88c0334..3ff9746 100644
--- a/netflow/ipfix.py
+++ b/netflow/ipfix.py
@@ -732,10 +732,15 @@ def __init__(self, data, template: List[Union[TemplateField, TemplateFieldEnterp
             # See comment in IPFIXFieldTypes.get_type_unpack for more information.
 
             field_type = IPFIXFieldTypes.by_id(field_type_id)  # type: Optional[FieldType]
-            if not field_type and type(field) is not TemplateFieldEnterprise:
-                # This should break, since the exporter seems to use a field identifier
-                # which is not standardized by IANA.
-                raise NotImplementedError("Field type with ID {} is not implemented".format(field_type_id))
+            if not field_type:
+                if type(field) is not TemplateFieldEnterprise:
+                    # This should break, since the exporter seems to use a field identifier
+                    # which is not standardized by IANA.
+                    raise NotImplementedError("Field type with ID {} is not implemented".format(field_type_id))
+                else:
+                    # This should break, since the exporter seems to use a field identifier
+                    # which is not suppored
+                    raise NotImplementedError("Field type with ID {} is not suppored".format(field_type_id))
 
             datatype = field_type.type  # type: str
             discovered_fields.append((datatype, field_type_id))