[#60] add null check for window

modules/camera/src/vkcv/camera/CameraManager.cpp

@@ -20,6 +20,7 @@ namespace vkcv::camera {
 		m_window.e_mouseScroll.remove(m_mouseScrollHandle);
 		m_window.e_mouseButton.remove(m_mouseButtonHandle);
 		m_window.e_resize.remove(m_resizeHandle);
+		m_window.e_gamepad.remove(m_gamepadHandle);
     }
 
     void CameraManager::bindCameraToEvents() {

src/vkcv/Window.cpp

@@ -119,7 +119,8 @@ namespace vkcv {
 
     void Window::onGamepadEvent(int gamepadIndex) {
         auto window = static_cast<Window *>(glfwGetJoystickUserPointer(gamepadIndex));
-        if (glfwJoystickPresent(gamepadIndex)) {
+
+        if ( window != nullptr && glfwJoystickPresent(gamepadIndex)) {
             window->e_gamepad(gamepadIndex);
         }
     }