add realm safety checks

amnet-native/app/CardManager.tsx

@@ -15,6 +15,10 @@ const {useQuery, useRealm} = RealmContext;
 function CardEntry(props: { card: AMCard }) {
     const realm = useRealm();
     const callback = useCallback(async (index: number) => {
+        if (!props.card.isValid()) {
+            return;
+        }
+        
         switch (index) {
             // copy card no
             case 0:
@@ -42,7 +46,7 @@ function CardEntry(props: { card: AMCard }) {
 
 export default function CardManager({navigation}) {
     const query = useQuery(AMCard);
-    const cards = useMemo(() => query.sorted("added", true), [query]);
+    const cards = useMemo(() => query.sorted("added", true).filter(x => x.isValid()), [query]);
     
     const theme = useTheme();
     

amnet-native/app/ServerCardIn.tsx

@@ -24,7 +24,21 @@ export default function ServerCardIn({route, navigation}) {
     const [selectedCard, setSelectedCard] = useState<AMCard>(null);
     const [cardInCompleted, setCardInCompleted] = useState<boolean>(null);
 
-    const unselectedCards = useMemo(() => cards.filter(x => !x._id.equals(selectedCard?._id)), [cards, selectedCard]);
+    const unselectedCards = useMemo(() => {
+        // protect against selected card being removed
+        switch (selectedCard?.isValid()) {
+            case true:
+                return cards.filter(x => !x._id.equals(selectedCard._id));
+                
+                // clear out invalid 
+            case false:
+                setSelectedCard(null);
+                return cards;
+                
+            default:
+                return cards;
+        }
+    }, [cards, selectedCard]);
 
     // server state
     const [serverInfo, setServerInfo] = useState<AMServer>(null);