diff --git a/src/olympic/turbine/src/glfw/gfx.cpp b/src/olympic/turbine/src/glfw/gfx.cpp
index d47b2c54..767cef8a 100644
--- a/src/olympic/turbine/src/glfw/gfx.cpp
+++ b/src/olympic/turbine/src/glfw/gfx.cpp
@@ -96,7 +96,7 @@ static void handleGlfwKeyEvent(GLFWwindow *window, int key, int, int action, int
 static void handleGlfwWindowCloseEvent(GLFWwindow *window) noexcept {
 	auto &ctx = *static_cast<Context*>(glfwGetWindowUserPointer(window));
 	ctx.mandatoryRefreshPeriodEnd = ticksMs(ctx) + config::MandatoryRefreshPeriod;
-	ctx.running = !ctx.shutdownHandler(ctx);
+	ctx.running = ctx.shutdownHandler ? !ctx.shutdownHandler(ctx) : false;
 	glfwSetWindowShouldClose(window, !ctx.running);
 	glfwPostEmptyEvent();
 }