Solana: I got an error when trying to sell tokens on pumpfun [error=Error processing instruction 2: Failed to complete program]

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Processing instruction 2 error: program could not be completed on Solana

As a developer using the Solana blockchain, you are probably aware of the importance of error handling when interacting with the network. In this article, we will explore why your recent attempt to sell tokens in PumpFun resulted in a processing instruction 2 error (Processing instruction 2 error: program could not be completed).

The problem

In your code snippet, you are trying to access a Solana mintData object that contains a token’s parsed information. However, this object is not properly initialized or formatted.

Specifically, when accessing the decimals property, you are using an expression with optional chaining (?.) like this:

const decimals = mintData.value?.data.parsed.info.decimals;

The problem is that mintData is not guaranteed to have a value or data object. If mintData is missing any of these properties, attempting to access their values ​​will result in an error.

The solution

To fix this problem, you need to make sure your mintData object has the required properties before attempting to access it. Here are some possible solutions:

• Add null checks: You can add additional null checks to check if value and data exist before attempting to access their values:

const decimals = mintData?.value?.data?.parsed?.info?.decimals;

This will ensure that you do not attempt to access the decimals property if mintData does not have a value, data, or parsed object.

• Use optional chaining with default values

  

  : Instead of using optional chaining, consider assigning default values ​​to missing properties:

const decimals = mintData?.value?.data.parsed.info.decimals ?? 0;

This will set the value of decimals to 0 if it is missing from either mintData.value, mintData.data.parsed.info.decimals, or neither.

• Explicit error checking: If you are using a TypeScript compiler such as TypeScript 4.7 and above, you can use the as const type annotation to raise an error if the property is not present:

const decimals: number = (mintData as const)?.value?.data.parsed.info?.decimals ?? 0;

This will ensure that your code will throw a TypeScript error if the required properties are missing, making it easier to identify and fix problems.

Conclusion

In summary, when using Solana with PumpFun, it is important to validate your mintData object before attempting to access its properties. By implementing null checks, default value assignments, or explicit type annotations, you can ensure that your code handles errors effectively and efficiently.

Remember that error handling is critical in multi-chain applications like PumpFun, as compatibility issues can arise when interacting with different blockchain networks.