diff --git a/main/gui/source/window/window.cpp b/main/gui/source/window/window.cpp
index e661aab27..9d5ebd044 100644
--- a/main/gui/source/window/window.cpp
+++ b/main/gui/source/window/window.cpp
@@ -388,7 +388,7 @@ namespace hex {
                 if (!anyWindowFocused) {
                     const auto platformIo = ImGui::GetPlatformIO();
                     for (auto *viewport : platformIo.Viewports) {
-                        if (platformIo.Platform_GetWindowFocus(viewport)) {
+                        if (platformIo.Platform_GetWindowFocus != nullptr && platformIo.Platform_GetWindowFocus(viewport)) {
                             anyWindowFocused = true;
                             break;
                         }