--- a/src/evaluate/visualization.py	2026-05-25 23:04:36.112310403 +0200
+++ b/src/evaluate/visualization.py	2026-05-25 23:05:32.135713980 +0200
@@ -225,6 +225,7 @@
         format_cfg=format_cfg,
     )
     for g in zip(data.index):
-        radar.plot(data.loc[g].values, label=g, marker=format_cfg["marker"], markersize=format_cfg["markersize"])
+        key = g[0] if isinstance(g, tuple) and len(g) == 1 else g
+        radar.plot(data.loc[key].values, label=key, marker=format_cfg["marker"], markersize=format_cfg["markersize"])
         radar.use_legend(**{"loc": format_cfg["legend_loc"], "bbox_to_anchor": format_cfg["bbox_to_anchor"]})
     return fig