diff --git a/src/profilingUtils.ts b/src/profilingUtils.ts
index 3aad403..9a5952d 100644
--- a/src/profilingUtils.ts
+++ b/src/profilingUtils.ts
@@ -13,6 +13,7 @@ let runId = -1;
  * The call that was chosen to be the dummy function is `system.currentTick`.
  */
 export function addIdleDummy() {
+  if (runId !== -1) return;
   runId = system.runInterval(idle, 1);
 }