Description:
Entering an expression in wxmaxima gives an error alert when 2d rendering (fractions, integrals) is required.
The error message appears in wxmaxima 17.10.0-1, downgrading to 17.05.1-1 (without changing the maxima version from 5.41.0-1) clears the problem.

Steps to reproduce:
Start wxmaxima, enter:

'integrate(sin(x), x, 0 %pi); <shift-Enter>

gives error. The screen display is also mangled. The error box gives:

ASSERT INFO:
./src/generic/graphicc.cpp(2085): assert "!m_font.IsNull()" failed in DoDrawText(): wxCairoContext::DrawText - no valid font set

BACKTRACE:
[1] wxCairoContext::DoDrawText(wxString const&, double, double)
[2] wxGCDCImpl::DoDrawText(wxString const&, int, int)
[3] Configuration::CharsExistInFont(wxFont, wxString, wxString, wxString)
[4] Configuration::GetGrouphesisDrawMode()
[5] ParenCell::RecalculateWidths(int)
[6] MathCell::RecalculateWidthsList(int)
[7] FunCell::RecalculateWidths(int)
[8] MathCell::RecalculateWidthsList(int)
[9] IntCell::RecalculateWidths(int)
[10] MathCtrl::InsertLine(MathCell*, bool)
[11] wxMaxima::DoConsoleAppend(wxString, int, bool, bool, wxString)
[12] wxMaxima::ConsoleAppend(wxString, int, wxString)
[13] wxMaxima::ReadMath(wxString&)
[14] wxMaxima::ClientEvent(wxSocketEvent&)
[15] wxEvtHandler::ProcessEventIfMatchesId(wxEventTableEntryBase const&, wxEvtHandler*, wxEvent&)
[16] wxEventHashTable::HandleEvent(wxEvent&, wxEvtHandler*)
[17] wxEvtHandler::TryHereOnly(wxEvent&)
[18] wxEvtHandler::ProcessEventLocally(wxEvent&)
[19] wxEvtHandler::ProcessEvent(wxEvent&)
[20] wxEvtHandler::ProcessPendingEvents()
[21] wxAppConsoleBase::ProcessPendingEvents()
[22] wxApp::DoIdle()
[23] g_main_context_dispatch
[24] g_main_loop_run
[25] gtk_main
[26] wxGUIEventLoop::DoRun()
[27] wxEventLoopBase::Run()
[28] wxAppConsoleBase::MainLoop()
[29] wxEntry(int&, wchar_t**)
[30] main
[31] __libc_start_main
[32] _start

Clearing the "Show this dialog next time" box and clicking Continue, gives correct operation for the remainder of the session.