snmpget()

I have php script that probes an IP range for specific SNMP information, one of the commands I use looks like this: $delta_nine = snmpget("$host","$community",".1.3.6.1.4.1.77.1.4.1.0"); All good so far. However.... if I probe some machines I get error messages like this: Warning: snmpget() [function.snmpget]: Error in packet: (noSuchName) There is no such variable name in this MIB. Warning: snmpget() [function.snmpget]: This name does not exist: SNMPv2-SMI::enterprises.77.1.4.1.0 Which is because that oid is inappropriate for whatever device it is I've hit... but this is exactly what the probe is trying to determine. Assuming everyone understands what I am trying to achieve here, what is they way round it? Suppress the messages somehow? Probe in a different way? ?? Many thanks PHP gurus of the world :o)