diff --git a/packages/core/src/runtime/actor.ts b/packages/core/src/runtime/actor.ts
index acd6b67..6c013eb 100644
--- a/packages/core/src/runtime/actor.ts
+++ b/packages/core/src/runtime/actor.ts
@@ -304,6 +304,13 @@ export class Turn {
             if (facet.actor.exitReason !== null) return;
             if (!facet.isLive) return;
         }
+        if (!facet.actor.space.isRunning()) {
+            facet.actor.space.queueTask({
+                perform() { Turn.for(facet, f, zombieTurn); },
+                describe() { return { type: 'externalTurn' } },
+            });
+            return;
+        }
         const t = new Turn(facet);
         try {
             const saved = Turn.active;
diff --git a/packages/core/src/runtime/space.ts b/packages/core/src/runtime/space.ts
index dee9a07..576470b 100644
--- a/packages/core/src/runtime/space.ts
+++ b/packages/core/src/runtime/space.ts
@@ -55,6 +55,10 @@ export class ActorSpace {
         this.inboundAssertions.delete(handle);
     }
 
+    isRunning() {
+        return this.state === ActorSpaceState.RUNNING;
+    }
+
     shutdown(reason: Exclude<ExitReason, null>) {
         if (this.state === ActorSpaceState.TERMINATED) return;
         this.state = ActorSpaceState.TERMINATED;
diff --git a/packages/core/src/runtime/task.ts b/packages/core/src/runtime/task.ts
index 6ab4b2c..84f9fef 100644
--- a/packages/core/src/runtime/task.ts
+++ b/packages/core/src/runtime/task.ts
@@ -15,6 +15,7 @@ export interface StructuredTask<T> {
 export type TaskDescription =
     | { type: 'bootActor', detail: q.OptionalAny }
     | { type: 'turn', tasks: TaskAction[] }
+    | { type: 'externalTurn' }
 ;
 
 export type TaskAction = { targetFacet: Facet, action: ActionDescription };