# My Stripe Sigma query with map lookup has stopped working

**Error Message:** “INVALID_FUNCTION_ARGUMENT: Key not present in map”
**Resolution:** `Use ELEMENT_AT()` instead of `[]` for map lookup.
For example, if your query looks like:
```
SELECT charge_id, metadata[‘customer’] FROM (
  SELECT charge_id, map_agg(key, value) AS metadata FROM charges_metadata
)
```
Change it to:
```
SELECT charge_id, ELEMENT_AT(metadata, 'customer') FROM (
  SELECT charge_id, map_agg(key, value) AS metadata FROM charges_metadata
)
```
## Additional Information
As of September 3rd 2020, Stripe Sigma supports queries using Prestosql v334 SQL syntax. As a part of this change, map lookup with `[]` will fail if the key is not present in the map. `ELEMENT_AT()`resumes the previous behavior of returning `NULL` for key absence.
Scheduled and saved queries have been updated accordingly.