Dead pointers
Division by zero
Integer overflows
Invalid bit shift operands
Invalid conversions
Invalid usage of STL
Memory management
Null pointer dereferences
Out of bounds checking
Uninitialized variables
Writing const data

Actually it is a good habit to run cppcheck regularly on the apps.

Get cppcheck installed on Mac using Brew

Open Terminal using Spotlight search by pressing <command+space> . Type terminal and hit Enter key.
Install cppcheck using brew. brew install cppcheck.

macOS usually shows you a crash diagnostic when an application crashes.

If you have a crash only in release mode, it's usually related to an uninitialized pointer.

I did this:
In my main.cpp

int main( ... )
{
....
signal( SIGFPE, handler );
signal( SIGSEGV, handler );
signal( SIGILL, handler );
signal( SIGABRT, handler );
signal( SIGKILL, handler );
signal( SIGSTOP, handler );
signal( SIGSYS, handler );

...

}

#include "signal.h"
#include "execinfo.h"
void handler(int a)
{
void *array[128];
char **string;
int size, i;

switch( a )
{
case SIGFPE:
case SIGSEGV:
case SIGILL:
case SIGABRT:
case SIGKILL:
case SIGSTOP:
case SIGSYS:
    qDebug() << "****** FATAL ERROR: Signal type" << a ;
    size = backtrace(array, 128);
    string = backtrace_symbols(array, size);
    if (string != NULL )
    {
        for ( int i = 0; i < size; i++ )
            qDebug() << string[i] ;
    }
    abort();
    break;

default:
    qDebug() << "Signal" << a << "- FATAL ERROR";
    break;
}

}