TheGraph Indexing Error

[mitchhs12]

Hi Everyone,

My Subgraph doesn't seem to be indexing my smart contract properly and is returning an error when I try to list and mint my NFT:

Error: failed to process trigger: block #10833449 (0x31bc…4cab), transaction 8a315286029c6e4c61db34c2cb508a2a92c26050265bcd8a3b2f39cad1036773: Entity ActiveItem[0x00x5d302d6a0071cddfffba28ab6d83e6e16b15b220]: missing value for non-nullable field buyerwasm backtrace: 0: 0x2deb - <unknown>!generated/schema/ActiveItem#save 1: 0x319c - <unknown>!src/nft-marketplace/handleItemListed
What does this mean and how can I fix it?

[mitchhs12]

Solved in schema.graphql ActiveItem should be buyer: Bytes not buyer:Bytes!

[PatrickAlphaC]

Nice!

[asserules]

Is this a viable solution? Your queries are gonna look for where buyer: null instead of "0x00000000" and the whole logic behind active items where 0x00dEad means cancelled, real address means bought and the "0x0000000" should represent not bought or canceled, .i.e it's listed. Is that ok?