Sticker Set Modal: Prevent exception when missing sticker set

src/components/common/StickerSetModal.tsx

@@ -61,7 +61,7 @@ const StickerSetModal: FC<OwnProps & StateProps & DispatchProps> = ({
           stickerSetId,
           stickerSetAccessHash,
         });
-      } else {
+      } else if (stickerSetShortName) {
         loadStickers({
           stickerSetShortName,
         });
@@ -134,7 +134,9 @@ export default memo(withGlobal(
     return {
       stickerSet: fromSticker
         ? selectStickerSet(global, fromSticker.stickerSetId)
-        : selectStickerSetByShortName(global, stickerSetShortName!),
+        : stickerSetShortName
+          ? selectStickerSetByShortName(global, stickerSetShortName)
+          : undefined,
     };
   },
   (setGlobal, actions): DispatchProps => pick(actions, [

src/components/main/Main.tsx

@@ -214,6 +214,10 @@ const Main: FC<StateProps & DispatchProps> = ({
     updateIcon(false);
   }, [updateIsOnline]);
 
+  const handleStickerSetModalClose = useCallback(() => {
+    openStickerSetShortName({ stickerSetShortName: undefined });
+  }, [openStickerSetShortName]);
+
   // Online status and browser tab indicators
   useBackgroundMode(handleBlur, handleFocus);
   useBeforeUnload(handleBlur);
@@ -236,8 +240,8 @@ const Main: FC<StateProps & DispatchProps> = ({
       <SafeLinkModal url={safeLinkModalUrl} />
       <HistoryCalendar isOpen={isHistoryCalendarOpen} />
       <StickerSetModal
-        isOpen={!!openedStickerSetShortName}
-        onClose={() => openStickerSetShortName({ stickerSetShortName: undefined })}
+        isOpen={Boolean(openedStickerSetShortName)}
+        onClose={handleStickerSetModalClose}
         stickerSetShortName={openedStickerSetShortName}
       />
     </div>