diff --git a/src/js/game/hud/parts/blueprint_placer.js b/src/js/game/hud/parts/blueprint_placer.js
index 3831af99..eb07ae18 100644
--- a/src/js/game/hud/parts/blueprint_placer.js
+++ b/src/js/game/hud/parts/blueprint_placer.js
@@ -75,6 +75,8 @@ export class HUDBlueprintPlacer extends BaseHUDPart {
             // Notice: Order here matters, since pipetteExecuted clears the blueprint
             this.root.hud.signals.pipetteExecuted.dispatch(contents);
             this.currentBlueprint.set(blueprint);
+        } else {
+            this.root.hud.signals.pipetteExecuted.dispatch(null);
         }
     }