D'oh!

I finished my law studies at the University of Vienna's Faculty of Law last October and do now (and since then) study economics in the same city. As a consequence, I will - hopefully - sooner or later have two university degrees (in different scientific fields). My question now is whether bad grades in economics could have any impact on my chances of getting admitted to any (good) law school's llm-programme? My track record concerning my studies of law is (as far as I can guess) quite satisfactory and would hopefully be good enough to have serious chances in this direction. Could a bad record in economics destroy my plans of graduate studies (especially in UK and US)?