Error while having multiple levels of Embedded Json Model

[Mograbi]

I'm trying out the following example:

from redis_om import Migrator, Field, JsonModel, get_redis_connection, EmbeddedJsonModel, HashModel
from pydantic import BaseModel
from typing import Optional

class Level2(EmbeddedJsonModel):
    c: str

class Level1(EmbeddedJsonModel):
    a: Optional[Level2]

class Model(JsonModel):
    a: str = Field(default="a", index=True)
    b: str = Field(index=True)
    c: Level1

    class Meta:
        global_key_prefix = "Mine"
        database = get_redis_connection(url="redis://172.17.0.2", db=0)
        model_key_prefix = "Model"

Migrator().run()
a1 = Model(**{"a": "a1", "b": "b1", "c": {"a": {"c": "empty"}}})

but keep getting the following error while running:

  File "/home/mmograbi/github/redis-om/test.py", line 26, in <module>
    a1 = Model(**{"a": "a1", "b": "b1", "c": {"a": {"c": "empty"}}})
  File "/home/mmograbi/.local/lib/python3.8/site-packages/redis_om/model/model.py", line 1510, in __init__
    super().__init__(*args, **kwargs)
  File "/home/mmograbi/.local/lib/python3.8/site-packages/redis_om/model/model.py", line 1131, in __init__
    super().__init__(**data)
  File "pydantic/main.py", line 342, in pydantic.main.BaseModel.__init__
pydantic.error_wrappers.ValidationError: 1 validation error for Model
c
  'NoneType' object is not subscriptable (type=type_error)

if I replace the EmbeddedJsonModel with BaseModel from pydantic it works as expected without exception.

Env:

• Python 3.8.10
• pydantic 1.10.6
• redis-om 0.1.2
• ubuntu 20.04