Although you have not indicated the reason that you filed the 2012 Form 8606, I'll assume that you did have reason to do so since you actually did file it, but it was prepared incorrectly since it omitted on line 2 the amount from line 14 of the 2011 Form 8606.
Yes, you should file a corrected 2012 Form 8606 since a correct amount is needed on line 14 to carry forward to your next-filed Form 8606. If the 2012 Form 8606 was filed only to report a new nondeductible traditional IRA contribution made for 2012, this will simply be to correct line 2 which will result in a correction to line 14. This corrected line 14 is what will carry over to your next-filed Form 8606, perhaps the one for 2017. Assuming that your originally filed Form 8606 was filed with your 2012 tax return, you should probably file the corrected Form 8606 with Form 1040X.
If the 2012 Form 8606 was instead filed to calculate the taxable and nontaxable portions of a traditional IRA distribution, you'll still end up with corrections to lines 2 and 14, as well as other lines, and you'll need to file the corrected Form 8606 with Form 1040X. However, since 2012 is generally a closed tax year for receiving any refund of excess taxes paid, you won't be receiving the refund that you calculate on Form 1040X. As in the case with a new nondeductible contribution, the amount from line 14 of the corrected 2012 Form 8606 will carry forward to line 2 of your next-filed Form 8606.
