QT error code -529697949 while allocating memory

I'm using Qt 5.11 with Qt Creator 4.7.1 and I'm developing on Windows 10.

When I create a lot of windows that contains charts, the program crashes. I suppose that's because it doesn't have enough memory, but I'm not sure. The error is always shown when I create something - that means when I allocate more memory.

I have a QMdiArea and a toolbar with some QToolButtons. When I click a QToolButton, I create a QMdiSubWindow that contains some information like charts, tables and so on. I have seen that the problem can appear also when I resize a QMdiSubWindow: When I resize a QMdiSubWindow I allocate more memory, watching the resources of the PC.

In debugging mode I get this error: -1: error: An exception was triggered: Exception at 0x4d47f50, code: 0xc000041d: , flags=0x0.

0x4d47f4e  <+0x00f6>        8b 30                    mov    (%eax),%esi
0x4d47f50  <+0x00f8>        89 31                    mov    %esi,(%ecx)
        213 [1] in painting\qmemrotate.cpp

The error I see in the application output pane is: .../myapp exited with code -529697949

I tried to search this code on the net but I didn't find something useful about this error.

I'd like at least to understand if it's a real problem of insufficient memory or not.