Solana: I get an error when trying to sell a token on pumpfun [error=Error processing instruction 2: The program failed to complete]

Error Processing Instruction 2: Program Failed to Complete on Solana

As a developer using the Solana blockchain, you are likely aware of the importance of handling errors when interacting with the network. In this article, we’ll delve into why your recent attempt to sell tokens in PumpFun resulted in an error processing instruction 2 (Error Processing Instruction 2: Program failed to complete).

The Issue

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

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

const decimals = mintData.value?.parseddata.info.decimals;

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

The Solution

To fix this issue, you need to ensure that your mintData object has the required properties before attempting to access them. Here are a few possible solutions:

• Add null checks

  

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

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

This ensures that you do not try 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 ​​for missing properties:

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

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

• Check for errors explicitly

  : If you are using a TypeScript compiler such as TypeScript 4.7 and above, you can use the as const type annotation to throw an error if the property does not exist:

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

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

Conclusion

In conclusion, when using Solana with PumpFun, it is essential 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, error handling is crucial in multi-chain applications like PumpFun, where compatibility issues can arise when interacting with different blockchain networks.