wxAssertionError: when entering characters in filter field of element list dialog (NVDA+f7)


Do you confirm it?
NVDA 2018.3rc3, w10 1803

Step to reproduce:
- open nvda user guide by firefox,
- open "Elementlist" dialog (nvda+f7)
- go to filter edit field
- enter the string "dddd"

The log:
ERROR - unhandled exception (19:04:23.622):
Traceback (most recent call last):
  File "browseMode.pyo", line 1025, in onFilterEditTextChange
  File "browseMode.pyo", line 890, in filter
wxAssertionError: C++ assertion "item.IsOk()" failed at ..\..\src\msw\treectrl.cpp(1032) in wxTreeCtrl::GetItemParam(): invalid tree item

Sory for my very bad english.

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