You are kidding right.
This has been long debated in the forum and the odds are so low as to be ridiculous.
I mean theres tons of addresses out there so its like how could you not hit one
Because there are this many possible valid 12 word seeds:
340,282,366,920,938,463,463,374,607,431,768,211,456
And there only approximately 30 million bitcoin addresses with balance on them. Divide those two numbers and you get a roughly 1 in 11 million trillion trillion chance of finding a collision. (Now, this is not quite accurate since any seed can generate potentially billions of addresses, but you get the idea.)
If we were talking about 24-word combinations, they are exponentially much smaller.