Leaking kitchen sink vent

I have just replumbed the double skink in my kitchen. The vent pipe (that I didn't do anything to) is now leaking. No joints are cracked (that I can tell) The home is an old log home and the vent pipe is PVC. It is leaking at the 90 degree elbow that goes into the log wall. Could it be condensation? The sinks are draining fine and there is no garbage disposal.

Pipe

It is not condensation, but unless it is below the drain line, and if it is really just a vent, it should not be leaking for any reason.

water droplets

so, where would those water droplets be coming from? Would a pic help?

Pictures never hurt. A vent should never have water in it. The only wat water should get into a vent at all is from rain or snow. Properly installed, vents slope gently toward the drain they are venting so the stay dry.