Possible issue passing map to function

I am encountering an issue when passing a map to one of my functions in C++. When running the code described below, I do not get a compile-time error but I do see a suspiciously long redirect statement from GDB https://imgur.com/o1YKl62

Here are high-level breakdowns of my code:

main.cpp

printStuff(map <string, vector<string> > Amap, (char) *argv[2]);

printStuff

void printStuff(map <string, vector<string> > Amap, char lett) {

  switch(lett) {
    //blah blah blah
  }

}

The function doesn't even get to the switch statement in GDB. After stepping into the initial call to printSomething, I get the statement above. The function then quits entirely out of printSomething, back to the main and onward from there.