crash in setVisible() of main window

Hello, i have some crashes in setVisible() of main window (QWidget). I cant reproduce it, but crash dumps that i get from about 0.5-1% users you can look on the sreenshot qt-bug1.png
Log says crash happens on first show of main window.
And other dumps say: screenshot qt-bug2.png
In this cases log says that it's not first show of main window (main window in tray by default) and there is dialog that shows above. And at the end i get error in log:
WindowCreationData::create: CreateWindowEx failed (Cannot create a top-level child window)
Qt-version: 5.2.1, 5.3.0, mayby other 5.x. Havent whis bug in 4.8.4
OS: different Windows
p.s. Sorry if my English is crazy