ImGui assert opening file window while rendering tooltip?

[sphaero]

1  __pthread_kill_implementation  pthread_kill.c   44   0x7ffff71caccc 
2  __pthread_kill_internal        pthread_kill.c   78   0x7ffff71cad2f 
3  __GI_raise                     raise.c          26   0x7ffff717bef2 
4  __GI_abort                     abort.c          79   0x7ffff7166472 
5  __assert_fail_base             assert.c         92   0x7ffff7166395 
6  __GI___assert_fail             assert.c         101  0x7ffff7174df2 
7  ImGui::Begin                   imgui.cpp        6298 0x55555559dced 
8  ImGui::BeginTooltipEx          imgui.cpp        8458 0x5555555a591d 
9  ImGui::BeginTooltip            imgui.cpp        8426 0x5555555a573b 
10 ActorContainer::RenderTooltip  ActorContainer.h 229  0x555555662482 
11 ActorContainer::RenderFilename ActorContainer.h 540  0x55555566371d 
12 ActorContainer::Render         ActorContainer.h 335  0x55555566298b 
13 UpdateActors                   stage.cpp        940  0x55555565e890 
14 UILoop                         main.cpp         576  0x5555555855b0 
15 main                           main.cpp         422  0x555555585062 

This assert:

                // Avoid focusing a window that is created outside of active modal. This will prevent active modal from being closed.
                // Since window is not focused it would reappear at the same display position like the last time it was visible.
                // In case of completely new windows it would go to the top (over current modal), but input to such window would still be blocked by modal.
                // Position window behind a modal that is not a begin-parent of this window.
                want_focus = false;
                if (window == window->RootWindow)
                {
                    ImGuiWindow* blocking_modal = FindBlockingModal(window);
 --->               IM_ASSERT(blocking_modal != NULL);
                    BringWindowToDisplayBehind(window, blocking_modal);
                }