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src/components/MultiSourceCaptioningView.tsx

@@ -23,10 +23,17 @@ function normalizeBoxes(raw: any): { label: string, bbox_2d: number[] }[] {
   } else if (typeof raw === "object" && raw !== null) {
     boxes = [raw];
   }
-  // Normalize bbox_2d to flat [x1, y1, x2, y2]
+  // Normalize bbox_2d to flat [x1, y1, x2, y2] only if valid
   return boxes.map(obj => {
     let bbox = obj.bbox_2d;
-    if (Array.isArray(bbox) && Array.isArray(bbox[0])) {
+    if (
+      Array.isArray(bbox) &&
+      bbox.length === 2 &&
+      Array.isArray(bbox[0]) &&
+      Array.isArray(bbox[1]) &&
+      bbox[0].length === 2 &&
+      bbox[1].length === 2
+    ) {
       // Convert [[x1, y1], [x2, y2]] to [x1, y1, x2, y2]
       bbox = [bbox[0][0], bbox[0][1], bbox[1][0], bbox[1][1]];
     }