Claimable Balances error when trying to claim the value

[CaioTeixeira95]

Hello everyone!

What version are you using?

SDK Version 4.1.1

What did you do?

I tried to claim a balance for the native asset on the Demo wallet.

First I ran the following script:

import time

from stellar_sdk.exceptions import NotFoundError, BadRequestError, BadResponseError
from stellar_sdk import (
    Keypair,
    Network,
    Server,
    TransactionBuilder,
    Asset,
    Claimant,
    ClaimPredicate,
    CreateClaimableBalance,
)


server = Server("https://horizon-testnet.stellar.org")

sender = Keypair.from_secret("SDZX46FKI6PRND3X6NP4U7W3P4U4GMOXLRXK6SVO2TPYH2K2AICCMDYK")
receiver = Keypair.from_public_key(
    "GAFMXOTSXIDUK64WAOJLWKRA7ELTC53COAQ2GOS3GQY2GV27JC3R7KQP"
)

# NOTE: Proper error checks are omitted for brevity; always validate things!

try:
    aAccount = server.load_account(sender.public_key)
except NotFoundError:
    raise Exception(f"Failed to load {sender.public_key}")

# Create a claimable balance with our two above-described conditions.
soon = int(time.time() + 60)
bCanClaim = ClaimPredicate.predicate_before_relative_time(60)
aCanClaim = ClaimPredicate.predicate_not(
    ClaimPredicate.predicate_before_absolute_time(soon)
)

# Create the operation and submit it in a transaction.
claimableBalanceEntry = CreateClaimableBalance(
    asset=Asset.native(),
    amount="100",
    claimants=[
        Claimant(destination=receiver.public_key, predicate=bCanClaim),
        Claimant(destination=sender.public_key, predicate=aCanClaim),
    ],
)

tx = (
    TransactionBuilder(
        source_account=aAccount,
        network_passphrase=Network.TESTNET_NETWORK_PASSPHRASE,
        base_fee=server.fetch_base_fee(),
    )
    .append_operation(claimableBalanceEntry)
    .set_timeout(180)
    .build()
)
tx.sign(sender)

try:
    txResponse = server.submit_transaction(tx)
    print("Claimable balance created!")
except (BadRequestError, BadResponseError) as err:
    print(f"Tx submission failed: {err}")

After this, I went to the Demo Wallet and logged in with my secret key, then I clicked to claim the balance.

What did you expect to see?

I expect to claim the balance and receive it to my account.

What did you see instead?

I received the following error:

instruction: Claiming asset native:undefined

instruction: Not a trusted asset, need to add a trustline

instruction: Adding native:undefined trustline

instruction: Loading account to get a sequence number for add trustline transaction

instruction: Building add trustline transaction

error: Add trustline transaction failed

Issuer cannot be null

error: Issuer cannot be null

[shanzzam]

Will triage this week 10/18

[shanzzam]

Thanks for the well-written issue @CaioTeixeira95! It was easy to replicate and find the issue. Will be fixing during this sprint.

[quietbits]

@CaioTeixeira95 the fix is live, please let us know if there is still an issue with it. Thanks again for reporting! 🙌