check if field is a dict before treating using it like a dict

app.py

@@ -68,7 +68,7 @@ def parse_metrics_rows(meta):
         if "dataset" not in result or "metrics" not in result:
             continue
         dataset = result["dataset"]["type"]
-        if "args" in result["dataset"] and "language" in result["dataset"]["args"]:
+        if "args" in result["dataset"] and "language" in result["dataset"]["args"] and isinstance(result["dataset"]["args"], dict):
             lang = result["dataset"]["args"]["language"]
         else:
             lang = meta["language"]