diff --git a/src/composables/useRdp.ts b/src/composables/useRdp.ts
index cb75735..9515db6 100644
--- a/src/composables/useRdp.ts
+++ b/src/composables/useRdp.ts
@@ -322,6 +322,7 @@ export function useRdp(): UseRdpReturn {
         rafScheduled = false;
         if (fetchPending) return;
         fetchPending = true;
+        if (!ctx) return;
         const rendered = await fetchAndRender(sessionId, width, height, ctx);
         fetchPending = false;
         if (rendered && !connected.value) connected.value = true;