diff --git a/src/hello_imgui/internal/backend_impls/abstract_runner.cpp b/src/hello_imgui/internal/backend_impls/abstract_runner.cpp
index db0a492e..376b4418 100644
--- a/src/hello_imgui/internal/backend_impls/abstract_runner.cpp
+++ b/src/hello_imgui/internal/backend_impls/abstract_runner.cpp
@@ -742,7 +742,11 @@ void AbstractRunner::InitRenderBackendCallbacks()
     }
     else if (params.rendererBackendType == RendererBackendType::Null)
     {
-        mRenderingBackendCallbacks = CreateBackendCallbacks_Null();
+        #ifdef HELLOIMGUI_USE_NULL
+            mRenderingBackendCallbacks = CreateBackendCallbacks_Null();
+        #else
+            IM_ASSERT(false && "Null backend is not available!");
+        #endif
     }
     else
     {