I'm running pre1.9.10 build 25525 and there following error gets logged all the time (several every minute usually, but sometimes a break of five minutes)

invalid SNMP OID at position 0: " "

This wasn't an issue in 1.9.9, but I upgraded to pre1.9.10 build 25456 to fix the can't add a template with triggers issue and it first appeared for me in that version. I tried upgrading to build 25525 this morning as I thought it would fix this issue as it was reported in ZBX-4675 but they fixed a crashing issue, not this issue.