diff --git a/src/components/pages/uniformity/form/UniformityForm.tsx b/src/components/pages/uniformity/form/UniformityForm.tsx
index 1ffbb969..d97a6aba 100644
--- a/src/components/pages/uniformity/form/UniformityForm.tsx
+++ b/src/components/pages/uniformity/form/UniformityForm.tsx
@@ -383,7 +383,7 @@ const UniformityForm = ({
     });
 
     return () => {
-      unsub();
+      unsub?.();
       useUiStore.getState().setExpandedDrawerOpen(false);
       useUiStore.getState().setExpandedDrawerContent(null);
       useUiStore.getState().setIsNextStep(false);