diff --git a/src/modules/graphics/opengl/wrap_Graphics.cpp b/src/modules/graphics/opengl/wrap_Graphics.cpp
index 5e69f5dc4..d452c22eb 100644
--- a/src/modules/graphics/opengl/wrap_Graphics.cpp
+++ b/src/modules/graphics/opengl/wrap_Graphics.cpp
@@ -745,8 +745,9 @@ int w_setCanvas(lua_State *L)
 	// discard stencil testing
 	instance->discardStencil();
 
-	// called with nil or none -> reset to default buffer
-	if (lua_isnoneornil(L,1))
+	// called with none -> reset to default buffer
+	// nil is an error, to help people with typoes
+	if (lua_isnone(L,1))
 	{
 		Canvas::bindDefaultCanvas();
 		return 0;