PVS-Studio warning V525 for Fennec Media Project

void* tag_write_setframe(char *tmem,
  const char *tid, const string dstr)
{
  ...
  if(lset)
  {
    fhead[11] = '\0';
    fhead[12] = '\0';
    fhead[13] = '\0';
    fhead[13] = '\0';
  }
  ...
}

This suspicious code was found in Fennec Media Project project by PVS-Studio static code analyzer.
Warning message is:
V525 The code containing the collection of similar blocks. Check items '11', '12', '13', '13' in lines 716, 717, 718, 719. id3 editor.c 716

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