function addCallers(PendingCaller[] calldata _callers) external onlyOwner {
    if (getPendingAcceptedCallersSetTime + UPDATE_WAITING_TIME > block.timestamp) {
        revert TooSoonError();
    }
    PendingCaller[] memory pendingCallers = getPendingAcceptedCallers; // @audit not check _callers.length == pendingCallers.length
    for (uint256 i = 0; i < _callers.length;) {
        ...
    }

    emit CallersAdded(_callers);
}
