Issue using sui::tx_context::sponsor(ctx)?

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Hey everyone

Im attempting to read the tx sponsor within a function. I can successfully build from my code, however publishing the contract always returns “failure due to VMVerificationOrDeserializationError in command 0”. This only happens when I include the following line

let sponsor_address = sponsor(ctx);

Even with the import but deleting this line, the contract successfully publishes. When I add the line back, the publish tx fails. I am wondering if just by virtue of including a red of the sponsor, the TransactionBlock needs a sponsor, and therefore the default CLI publish method does not work? Please advise

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Looking at your issue with sui::tx_context::sponsor(ctx), this appears to be related to how the Sui VM handles sponsored transactions and the sponsor() function.

Analysis of Your Issue

The problem you’re experiencing is likely due to one of these reasons:

1. VM Verification Issue

The sponsor() function might be causing verification issues during publishing because:

  • The VM expects certain conditions to be met when sponsor-related functions are called
  • There might be a mismatch between the transaction context and the function expectations

2. Publishing Context

When you publish using the CLI without a sponsor, but your code calls sponsor(ctx), there might be a context mismatch that causes the VM verification to fail.

Solutions

Option 1: Conditional Sponsor Handling

public fun safe_get_sponsor(ctx: &TxContext): Option<address> {
    // Always returns an Option, safe to call
    tx_context::sponsor(ctx)
}

Option 2: Wrap in Try-Catch Pattern

public fun get_sponsor_info(ctx: &TxContext): (address, bool, Option<address>) {
    let sender = tx_context::sender(ctx);
    let sponsor_opt = tx_context::sponsor(ctx);
    let has_sponsor = std::option::is_some(&sponsor_opt);
    
    (sender, has_sponsor, sponsor_opt)
}

Option 3: Publishing with Sponsor

If your contract requires sponsor functionality, you might need to publish it as a sponsored transaction:

# Publish with sponsor (if you have sponsor setup)
sui client publish --gas-budget 20000000 --sponsor <SPONSOR_ADDRESS>

Debugging Steps

  1. Check Sui Version: Ensure you’re using a compatible version of Sui
  2. Test Locally: Run sui move test to see if tests pass
  3. Simplify: Try publishing without the sponsor line first, then add it back
  4. Check Logs: Look at the detailed error logs for more specific VM errors

Recommended Approach

Use the conditional handling pattern from the code above. The sponsor() function should be safe to call, but wrapping it in proper error handling and conditional logic will make your contract more robust.

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