Random Segmentation Fault - Raspberry Pi, C++, MySQL - c++

Question

I'm having an issue with segmentation faults crashing my c++ program. I've narrowed it down to executing mysql queries. If I remove the query it never crashes but when it does run the query it may work 5 times in a row and crash or it might go 20 times before a segmentation fault, it's very random.
This is the code to connect.
MYSQL *conn;
void connectMysql(){
const char *server = "localhost";
const char *user = "root";
const char *password = "myPpassword";
const char *database = "myDatabase";
conn = mysql_init(NULL);
/* Connect to database */
if (!mysql_real_connect(conn, server,
user, password, database, 0, NULL, 0)) {
fprintf(stderr, "%s\n", mysql_error(conn));
exit(1);
}
}
Then I do this to run my queries. It'll happen with other queries as well.
connectMysql();
std::string query = "UPDATE settings SET tempFormat = '" + to_string(tempFormat) + "'";
std::cout << query << std::endl; // print string to terminal
mysql_query(conn, query.c_str());
std::cout << "done" << std::endl; // print done to terminal
mysql_close(conn);
Using std::cout to write to terminal it looks like it's happening with mysql_query function. I print the query string to terminal and that always looks good going into mysql_query even when it crashes. When it does crash I never see the "done" printed to terminal so it doesn't make it that far.
I've just recently discovered this as I don't save to database that often so not exactly sure what c++ mysql library I'm using but this is what I use to install it.
sudo apt-get install libmariadb-dev-compat libmariadb-dev -y
Thanks