K Edge Clamp Road Chain Catcher Gun Metal 34 9mm Road Bike Cyclocross | eBay
you could buy on of these.
I have there braze on version on my road bike for cheap insurance agianst chain drops.

Disregard the following if its a 1x set up .
Have you had the front derailur adjusted? The cables housing may have set in resulting in the front derailur haveing to much clearence inward.