Table key already exists: duplicate key insertion prohibited. Root cause: Calling table::add with a key that is already stored in Table<K, V>.

Resolution: Mutate existing entry via table::borrow_mut or check existence before insertion. Recommended remediation: Check table::contains before calling table::add. Use table::borrow_mut if updating an existing record.

Severity Revert · Sui Framework (0x2)

0x2::table::EKeyAlreadyExists (Abort 100)

Q: How do I fix '0x2::table::EKeyAlreadyExists (Abort 100)'?

To resolve this error: Check table::contains before calling table::add. Use table::borrow_mut if updating an existing record.

0x2::table::EKeyAlreadyExists(abort 100)

Why Did This Transaction Revert?

Calling table::add with a key that is already stored in Table<K, V>.

Smart Contract Revert Point

assert!(!table::contains(table, key), EKeyAlreadyExists);

💧 Native Sui Move Code & Fix

Move 2024

if (!table::contains(&table, key)) {
    table::add(&mut table, key, value);
} else {
    *table::borrow_mut(&mut table, key) = value;
};

Step-by-Step Resolution Checklist

Check table::contains before calling table::add.

Use table::borrow_mut if updating an existing record.

Diagnostic Actions

Target Chain:

Recommended Gas Limit: units

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