Fix

app.py

@@ -129,8 +129,11 @@ def update_df(
                 raise gr.Error(str(e)) from e
         else:
             paper_ids, scores = semantic_search(search_query, candidate_pool_size, score_threshold)
-            df = pl.DataFrame({"paper_id": paper_ids, "score": scores}).join(df, on="paper_id", how="inner")
-            df = df.sort("score", descending=True).drop("score")
+            if not paper_ids:
+                df = df.head(0)
+            else:
+                df = pl.DataFrame({"paper_id": paper_ids, "score": scores}).join(df, on="paper_id", how="inner")
+                df = df.sort("score", descending=True).drop("score")
 
     if presentation_type != "(ALL)":
         df = df.filter(pl.col("Type").str.contains(presentation_type))