diff --git a/src/behavior.ts b/src/behavior.ts
index d790572..99fc079 100644
--- a/src/behavior.ts
+++ b/src/behavior.ts
@@ -69,7 +69,7 @@ export abstract class Behavior<A> extends Reactive<A, BListener>
   }
   abstract update(t: number): A;
   pushB(t: number): void {
-    if (this.pulledAt !== t) {
+    if (this.state !== State.Inactive && this.pulledAt !== t) {
       this.pull(t);
       if (this.changedAt === t && this.state === State.Push) {
         pushToChildren(t, this);
diff --git a/test/placeholder.ts b/test/placeholder.ts
index 7b7767f..62fd0a9 100644
--- a/test/placeholder.ts
+++ b/test/placeholder.ts
@@ -241,6 +241,26 @@ describe("placeholder", () => {
       p.replaceWith(H.Behavior.of(3));
       assert.strictEqual(H.at(b3), 16);
     });
+    it("handles behavior depending on two placeholder", () => {
+      //   p1  p2
+      //   \   /
+      //    b3
+      const p1 = H.placeholder<number>();
+      const p2 = H.placeholder<number>();
+      const b3 = H.lift(
+        (n, m) => {
+          assert.isNumber(n);
+          assert.isNumber(m);
+          return n + m;
+        },
+        p1 as Behavior<number>,
+        p2
+      );
+      subscribeSpy(b3);
+      p1.replaceWith(H.Behavior.of(3));
+      p2.replaceWith(H.Behavior.of(2));
+      assert.strictEqual(H.at(b3), 5); //12);
+    });
   });
   describe("stream", () => {
     it("is stream", () => {