Upload public.js

backend/src/routes/public.js

@@ -415,6 +415,11 @@ router.get('/screenshot/:userId/:pptId/:slideIndex?', async (req, res, next) =>
       return res.status(404).json({ error: 'PPT not found' });
     }
 
+    // Check if slides array exists
+    if (!pptData.slides || !Array.isArray(pptData.slides)) {
+      return res.status(400).json({ error: 'Invalid PPT data: slides not found' });
+    }
+
     const slideIdx = parseInt(slideIndex);
     if (slideIdx >= pptData.slides.length || slideIdx < 0) {
       return res.status(404).json({ error: 'Invalid slide index' });
@@ -659,6 +664,11 @@ router.get('/screenshot-data/:userId/:pptId/:slideIndex?', async (req, res, next
       return res.status(404).json({ error: 'PPT not found' });
     }
 
+    // Check if slides array exists
+    if (!pptData.slides || !Array.isArray(pptData.slides)) {
+      return res.status(400).json({ error: 'Invalid PPT data: slides not found' });
+    }
+
     const slideIdx = parseInt(slideIndex);
     if (slideIdx >= pptData.slides.length || slideIdx < 0) {
       return res.status(404).json({ error: 'Invalid slide index' });