diff --git a/frontend/src/pages/Scans.tsx b/frontend/src/pages/Scans.tsx
index 3e38f3ad..0e93cd90 100644
--- a/frontend/src/pages/Scans.tsx
+++ b/frontend/src/pages/Scans.tsx
@@ -105,7 +105,9 @@ export default function Scans() {
       if (document.visibilityState === "hidden") {
         stopPolling();
       } else {
-        loadTasks();   // immediate refresh when tab comes back
+        abortRef.current?.abort();
+        abortRef.current = new AbortController();
+        loadTasks();
         startPolling();
       }
     }
@@ -114,7 +116,10 @@ export default function Scans() {
 
     return () => {
       stopPolling();
-      abortRef.current?.abort();
+      if (abortRef.current) {
+        abortRef.current.abort();
+        abortRef.current = null;
+      }
       document.removeEventListener("visibilitychange", handleVisibilityChange);
     };
   }, [filter, page]);
@@ -709,4 +714,4 @@ export default function Scans() {
       />
     </div>
   );
-}
\ No newline at end of file
+}