Segmentation fault manipulating map c++

I don't understand why I get segmentation fault on this code inside the "if" conditional, and when is out out it, it works perfectly.. The map cidades starts empty. Here is the code: int i,cont = 0; // counters string line; map<string,int> cidades; ... open a txt file here ... while(getline(element, line, ',')){ if(i == 1) { std::map<std::string, int>::iterator it = cidades.find(line); // get the error when I try to print here // without the line bellow, there is no error //it looks like the if is always true cout << "ele: " << it->first << " key: " << it->second; if(it == cidades.end()){ // insert map cidades.insert(pair<string,int>(line,cont)); c1 = cont; }else{ // get the key c1 = cidades.at(line); } } cont++; i++; } But when I put the same code out of the conditionals above.. it works string a = "teste"; // taken from the txt and added into the map std::map<std::string, int>::iterator it = cidades.find(a); cout << "ele: " << it->first << " chave: " << it->second; it prints teste and the key... but when I try to print inside the if I got segmentation fault(core dumped).