My Python kernel restarts ton the on the reload (only part of a larger program

self.map_browser = QWebEngineView()
self.map_browser.reload()

Error:
Windows fatal exception: access violation

Current thread 0x00006338 (most recent call first):
File "c:..\model.py", line 1366 in refresh_map

Anyone an idea how i could resolve?

Thanks in advance,
Johannes