diff --git a/src/mol-plugin-ui/hooks/use-behavior.ts b/src/mol-plugin-ui/hooks/use-behavior.ts
index 61263df551ab8135d06c09cd25f7e78583a07322..7ba6aa432475cf3e15c2e85aa099b5a48c99e44a 100644
--- a/src/mol-plugin-ui/hooks/use-behavior.ts
+++ b/src/mol-plugin-ui/hooks/use-behavior.ts
@@ -19,7 +19,10 @@ export function useBehavior<T>(s: Behavior<T> | undefined): T | undefined {
     const [value, setValue] = useState(s?.value);
 
     useEffect(() => {
-        if (!s) return;
+        if (!s) {
+            if (value !== void 0) setValue(void 0);
+            return;
+        }
         let fst = true;
         const sub = s.subscribe((v) => {
             if (fst) {