diff --git a/lyra-game/src/render/graph/mod.rs b/lyra-game/src/render/graph/mod.rs
index ba50510..21fe746 100644
--- a/lyra-game/src/render/graph/mod.rs
+++ b/lyra-game/src/render/graph/mod.rs
@@ -132,6 +132,11 @@ impl RenderGraph {
                 // if there is a slot of the same name
                 slot.id = *id;
             } else {
+                debug_assert!(!self.slots.contains_key(&slot.id),
+                    "Reuse of id detected in render graph! Pass: {}, slot: {}",
+                    desc.name, slot.name,
+                );
+
                 let res_slot = ResourcedSlot {
                     name: slot.name.clone(),
                     ty: slot.ty,