Happens all the time.

Used to happen with me. I wud write the code, worked fine on my local environment, but on dev env, it wud crash. After sum tuning, it wud run fine on dev as well, but crashed on test env. Again after sum tuning, it worked on local, dev, and test environments, but this tym, it wud crash on production environment. And a crash on production env was a nightmare. Damn. Those days.