[Help Needed]: ImGui `AddFont` assertion failure when running SDL2 template

[PerHac13]

Description I’m trying to set up ImGui with SDL2 using this template. The build completes successfully, but when I run the app, it crashes with an assertion error from ImGui.

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Steps to Reproduce

1. Clone the repository.

2. Build using the following commands:

   cmake -GNinja -DCMAKE_BUILD_TYPE=Debug -B build/debug
   cmake --build build/debug
   

3. Run:

   ./build/debug/src/app/App
   

4. Observe the crash.

Note: A window briefly appears without any ImGui components before the application crashes. Running from WSL2 Ubuntu

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Actual Behavior

[18:11:02] APP(debug): Current SDL_Renderer: opengl
[18:11:02] APP(debug): User config path: /path/.local/share/com.mycompany/BasicGuiProjectSetup/
App: /mypath/cpp-gui-template-sdl2/build/debug/_deps/imgui-src/imgui_draw.cpp:2535: ImFont* ImFontAtlas::AddFont(const ImFontConfig*): Assertion `font_cfg->SizePixels > 0.0f && "Is ImFontConfig struct correctly initialized?"' failed.
Aborted (core dumped)

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Expected Behavior The application should run without crashing and display the default GUI.

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Environment

• OS:

  • Windows 11 (base)
  • Ubuntu 22.04 in WSL2 (running here)

• Compiler: GCC 13.3.0

• Build System: Ninja + CMake

• CMake Version: 3.28.3

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Additional Query

• What is profile.json and why is it being saved to this path?

  User config path: /path/.local/share/com.mycompany/BasicGuiProjectSetup/
  

  Do I need to set up something for it manually?

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Additional Context I’m new to setting up ImGui with SDL2. I chose this template because the documentation is great, but I still can’t figure out how to resolve the crash. Any help would be greatly appreciated!

Thanks