peass-ng/PEASS-ng · error · InvalidOperationException

Same key already exists.

Error message

Same key already exists.

What it means

A duplicate-key guard in RehashableDictionary.ReplaceKeyValue (reached from AddCore): when replacing an existing key/value pair in exclusive mode, the new key collides with one already stored, which the exclusive contract forbids; the sentinel message indicates the second Add of an already-present key.

Source

Thrown at winPEAS/winPEASexe/winPEAS/3rdParty/YamlSerializer/RehashableDictionary.cs:188

                },
                (hash, oldkv) => {                      // hash hit one entry and key found
                    ReplaceKeyValue(oldkv, newkv, exclusive);
                },
                (hash, list) => {                       // hash hit several entries but key not found
                    list.Add(newkv);
                    hashes.Add(key, hash);
                },
                (hash, oldkv, list, i) => {             // hash hit several entries and key found
                    ReplaceKeyValue(oldkv, newkv, exclusive);
                }
                );
            OnAdded(key, value);
        }

        void ReplaceKeyValue(KeyValue oldkv, KeyValue newkv, bool exclusive)
        {
            if ( exclusive )
                throw new InvalidOperationException("Same key already exists.");
            var oldkv_saved = new KeyValue(oldkv.key, oldkv.value);
            oldkv.key = newkv.key;
            oldkv.value = newkv.value;
            hashes.Remove(oldkv_saved.key);
            OnRemoved(oldkv_saved.key, oldkv_saved.value);
        }

        bool RemoveCore(K key, bool compareValue, V value)
        {
            bool result = true;
            FindItem(key, compareValue, value,
                (hash) => { result = false; },      // key not found
                (hash, kv) => {                     // hash hit one entry and key found
                    items.Remove(hash);
                    hashes.Remove(kv.key);
                    OnRemoved(kv.key, kv.value);
                },
                (hash, kv, list, i) => {            // hash hit several entries and key found

View on GitHub (pinned to 53fb989abc)

Solutions

1. Check ContainsKey/TryGetValue before adding, or use the non-exclusive replace path
2. Use the indexer setter (AddCore with exclusive=false) to overwrite existing keys
3. Ensure key generation produces unique keys (composite keys, normalization)

When it happens

Trigger: Thrown at winPEAS/winPEASexe/winPEAS/3rdParty/YamlSerializer/RehashableDictionary.cs:188 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of peass-ng/PEASS-ng@53fb989abc (2026-09-02). Data as JSON: /api/errors/140fd76c4d40c909. Report an issue: GitHub.