Sound bug: Blue side nexus turrets

The laser beam sound got stuck on the nexus turrets for some time in my latest game. There were no enemies near and nothing was being attacked, but the sound was still looping. I only heard the sound when my screen was hovering over the turret.

Sorry, I wasn't really paying attention to it otherwise. I don't even know if it went away when the turret died or not. That's all the info I have. :/