human
Solve the following python programming problem given the following code:
def _cmp_by_router_id(local_asn, path1, path2) : 
    'Select the route received from the peer with the lowest BGP router ID.

    If both paths are eBGP paths, then we do not do any tie breaking, i.e we do
    not pick best-path based on this criteria.
    RFC: http://tools.ietf.org/html/rfc5004
    We pick best path between two iBGP paths as usual.
    ' 
    def get_asn(path_source) : 
        if (path_source is None) : 
            return local_asn 
else : 
            return path_source.remote_as 
def get_router_id(path_source, local_bgp_id) : 
        if (path_source is None) : 
            return local_bgp_id 
else : 
            return path_source.protocol.recv_open_msg.bgp_identifier 
path_source1 = path1.source 
    path_source2 = path2.source 
    if ((path_source1 is None) and (path_source2 is None)) : 
        return None 
asn1 = get_asn (path_source1) 
    asn2 = get_asn (path_source2) 
    is_ebgp1 = (asn1 != local_asn) 
    is_ebgp2 = (asn2 != local_asn) 
    if (is_ebgp1 and is_ebgp2) : 
        return None 
if (((is_ebgp1 is True) and (is_ebgp2 is False)) or ((is_ebgp1 is False) and (is_ebgp2 is True))) : 
        raise ValueError ('This method does not support comparing ebgp with ibgp path') 
if (path_source1 is not None) : 
        local_bgp_id = path_source1.protocol.sent_open_msg.bgp_identifier 
else : 
        local_bgp_id = path_source2.protocol.sent_open_msg.bgp_identifier 
router_id1 = get_router_id (path_source1, local_bgp_id) 
    router_id2 = get_router_id (path_source2, router_id2) 
    if (router_id1 == router_id2) : 
        return None 
from ryu.services.protocols.bgp.utils.bgp import from_inet_ptoi 
    if (from_inet_ptoi (router_id1) < from_inet_ptoi (router_id2)) : 
        return path1 
else : 
        return path2 

    
    

    Fix the buggy line: router_id2 = get_router_id (path_source2, router_id2)
assistant
#Here is Python program to fix the buggy line: router_id2 = get_router_id (path_source2, router_id2)
.

router_id2 = get_router_id (path_source2, local_bgp_id)