Any third party user can overwrite the 0 couple message
If the user is not has a couple, then it will default to ownerToId[msg.sender]
value 0
and can rewrite the message
A couple may receive the wrong message from a third party
Manual review
Add a check for null value
Medium Severity, This has an indirect impact and influence on the possibility of divorce between soulmates owning the first soulmate NFT id0, leading to permanent loss of ability to earn airdrops/staking rewards.
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