It's no problem, but it could lead to a mess down the road. Are you using a 3-piece or S-bubbler airlock? On my 3-piece I trim the "X" off the bottom of the stem that goes into the fermenter. Hop bits like to clog the X and will blow the whole airlock off.
You can, and probably should, rig up a blowoff tube. Take a length, several feet or as much is needed, of vinyl hose- your transfer hose should work fine- and replace the airlock with the hose. If you're using a 3-piece airlock you can take the top disc off and remove the dome thing that moves, and slide the vinyl hose over the stem. Anyway, the other end of the hose goes in to a vessel of water (water jug, water bottle, pot of water, whatever). Make sure the end is submerged and you're good to go! Kyle