diff --git a/scene/main/viewport.cpp b/scene/main/viewport.cpp
index ff8f0d05f10..68f5a252e52 100644
--- a/scene/main/viewport.cpp
+++ b/scene/main/viewport.cpp
@@ -1331,11 +1331,11 @@ Matrix32 Viewport::_get_input_pre_xform() const {
 	Matrix32 pre_xf;
 	if (render_target) {
 
-		ERR_FAIL_COND_V(to_screen_rect.size.x==0,pre_xf);
-		ERR_FAIL_COND_V(to_screen_rect.size.y==0,pre_xf);
+		if (to_screen_rect!=Rect2()) {
 
-		pre_xf.elements[2]=-to_screen_rect.pos;
-		pre_xf.scale(rect.size/to_screen_rect.size);
+			pre_xf.elements[2]=-to_screen_rect.pos;
+			pre_xf.scale(rect.size/to_screen_rect.size);
+		}
 	} else {
 
 		pre_xf.elements[2]=-rect.pos;