I wrote my master thesis in Germany and submitted it on time. After checking I notice some small typing errors and some problems with my references (minor ones, not a problem really). I just saw a horrible mistake: I accidentally added the same paragraph (300 words) twice in a row. This resulted from how I prefer to use secondary programs to check my thesis for mistakes.
I wrote to my supervisor but he did not reply. I know it is not considered self plagiarism because it is my work, and I am not trying to get credit twice. I fear that I will fail because a master's thesis is not supposed to have errors such as this. Is there anything I can do? In German universities, corrections after submission are not allowed, so I can not delete this chapter.
An update: I successfully defend my thesis, (however they drop 10% of my grade because of duplication and about 5% for other typing mistakes, so overall i got 84.7% or 2.0).