object of type 'NoneType' has no len()

[freeziii]

"object of type 'NoneType' has no len()"
it gives me this error when trying to send or when trying to export private keys

[faithinvw]

I've been getting this error as well today, I get it when trying to do Anything in my account that requires me to input my password. I was able to receive BTC today but unable to send it out. I've emailed thier support team and will let you know what they say when they get back to me

[ecdsa]

does it show something more in the console?

[freeziii]

no it doesnt say anything in the console

[ecdsa]

which version /OS are you running?

[freeziii]

2.7.1 & win10

[ecdsa]

are you able to display your seed or to update your password?

[freeziii]

no. its gives me that error when trying to do almost anything in the wallet menu

[ecdsa]

does it give that too if you enter a wrong password?

[freeziii]

no, it says invalid password.

[ecdsa]

ok, if you restore your wallet from seed, does the new wallet have the same issue?
(do it in a new wallet file)

[freeziii]

the balance stays at 0.00 when restored but not on the original

[ecdsa]

that suggests you're not restoring with the correct seed.
do the wallets have the same addresses?

[freeziii]

no idk how

[ecdsa]

@faithinvw can you try to restore from seed in another file, and report if it works?

[freeziii]

it did

[ecdsa]

@freezi please explain what you mean by "it did"

[freeziii]

i restored from another files seed and the addresses matched up. but when i restore from the seed in the original wallet it doesnt match

[ecdsa]

can you send me an email to electrumdev@gmail.com ?

[ecdsa]

in the console, what does 'wallet.keystore' return?

[freeziii]

emailed you

[ecdsa]

see https://bitcointalk.org/index.php?topic=1637501.0

[faithinvw]

I made a new wallet with my seed and the issue was resolved. Thanks for the advice/help!

[ecdsa]

@faithinvw please also upgrade Electrum, the issue is fixed in recent versions

[SomberNight]

User "jmoney" on IRC reported this today. He claimed to be user jb0y3 from bitcointalk.

He had originally set up a 2fa wallet using 2.7.0, probably encountered this bug there, and then subsequently upgraded to 2.7.18 and 3.0.3 keeping the same wallet file.
He had lost his seed words unfortunately, but he had this erroneous wallet file and also access to one time password through Google Auth. He also knew what the password for the wallet file was supposed to be.

The trace for the error, using the in-app QT console:

>> wallet.keystore.check_password("correctpassword")
Traceback (most recent call last):
File "site-packages\electrum-3.0.3-py3.5.egg\electrum\bitcoin.py", line 935, in deserialize_xprv
File "site-packages\electrum-3.0.3-py3.5.egg\electrum\bitcoin.py", line 915, in deserialize_xkey
TypeError: object of type 'NoneType' has no len()

I asked him to run this command in the console:

bitcoin.pw_decode(wallet.keystore.xprv, "correctpassword")

The output looked like an encrypted xprv.
He then modified his wallet file so that "x1/">"xprv" now contained the output of above command.

Also, Electrum thought that the wallet file did not have a password, so he changed "use_encryption" to be true.

After this, he was able to send the coins out of this wallet.