The Stupidest Thing the League of Nations Ever Did

What was the most stupid thing the League of Nations had done? We can choose the failure of the League in Manchurian crisis and Abyssinia crisis, because these became important cause of World War II. Thus, these two things were also very huge affairs in history.
Manchurian crisis happened in 1931 through invasion of japan to Manchuria. (The cause of this crisis was desire of Japan to build on empire.) And this crisis results terrible things to the League.
At first, everyone was ashamed of the League and the League scared no one.
League couldn't do anything about this crisis. When Japan kicked out the chinese and set up their own government, China asked for help to the League of Nations.
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