diff --git a/backends/imgui_impl_win32.cpp b/backends/imgui_impl_win32.cpp
index 7cc57178847b..f8304d5c210c 100644
--- a/backends/imgui_impl_win32.cpp
+++ b/backends/imgui_impl_win32.cpp
@@ -513,6 +513,8 @@ IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hwnd, UINT msg, WPARA
 
     ImGuiIO& io = ImGui::GetIO();
     ImGui_ImplWin32_Data* bd = ImGui_ImplWin32_GetBackendData();
+    if (bd == nullptr)
+        return 0;
 
     switch (msg)
     {