# SDK_SEEN_SET_TTL_INVALID

- Surface: SDK

## Cause

The seen-set TTL is not a positive duration.

## Fix

Pass a positive number of milliseconds, or omit it for the default.

## Related

- [SDK_SEEN_SET_MAX_SIZE_INVALID](https://splitch.dev/docs/error/SDK_SEEN_SET_MAX_SIZE_INVALID)

Source: https://splitch.dev/docs/error/SDK_SEEN_SET_TTL_INVALID