SDL_PollEvents - Part of the code that are executed without key being pressed. Situation not desired - c++

Question

My program has to quit when I press ESC key. Even not pressing the key, my program exit automatically after some seconds of execution. No errors or notable exceptions found during the execution and the code seems to be correct.
void pollE(bool& _isRunning, build *actionBuild,finance *money,squareId* slotId,squareId map[][MAP_SLOTS_H]) {
while (SDL_PollEvent(&event)) {
// MOUSE
switch (event.button.button) {
case SDL_BUTTON_LEFT:
if (event.button.state == SDL_RELEASED) {
actionBuild->construct(ID_CASA, map);
}
if (event.button.state == SDL_PRESSED) {
}
break;
case SDL_BUTTON_RIGHT:
if (event.button.state == SDL_RELEASED) {
// test
debugPrintMap(map);
}
if (event.button.state == SDL_PRESSED) {
}
break;
}
// KEYBOARD
switch (event.key.keysym.sym) { // ---------------------------- HERE
case SDLK_ESCAPE: // ------------------------------------------ HERE
_isRunning = false; // ------------------- to stop mainLoop()
break;
case SDLK_SPACE:
break;
default:
break;
}
}
The function is called here:
void mainLoop() {
(...)
while (isRunning == true) {
dealWithEvents->pollE(isRunning,actionBuild,money,slotId,map);
preDraw();
draw();
afterDrawEffects();
draw();
(...)
}
(...)
}