diff --git a/packages/core/src/runtime/actor.ts b/packages/core/src/runtime/actor.ts
index 11391e0..f0e5065 100644
--- a/packages/core/src/runtime/actor.ts
+++ b/packages/core/src/runtime/actor.ts
@@ -366,6 +366,9 @@ export class Turn {
     }
 
     stop(facet: Facet, continuation?: LocalAction) {
+        if (facet.actor !== Turn.activeFacet.actor) {
+            throw new Error("Attempt to terminate a facet in a different actor");
+        }
         if (continuation) facet.onStop(continuation);
         facet._terminate(true);
     }