Error when tying to insert records of "None" type

[kenBinary]

I tried to insert a record with None type but it resulted in this error:

thread '<unnamed>' panicked at src/lib.rs:411:39:
not yet implemented
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
Traceback (most recent call last):
  File "/home/user/project/test.py", line 45, in <module>
    cursor.execute("insert into test_table values (?,?);", tuple(["some text", None]))
pyo3_runtime.PanicException: not yet implemented

Code:
cursor.execute("insert into test_table values (?,?);", tuple(["some text", None]))