diff --git a/plotter.py b/plotter.py
index da141c4..6d12bfb 100644
--- a/plotter.py
+++ b/plotter.py
@@ -1145,7 +1145,7 @@ class Plotter(Aggregator, BaseProcessor):
             x, y = x[mask], y[mask]
         elif "mean" in node_y:
             x = node_x * xunit_old.express(xunit)
-            y = node_y.mean * yunit_old.express(yunit)
+            y = node_y["mean"] * yunit_old.express(yunit)
 
             if yerr_kind == "std":
                 std = node_y["std"] * yunit_old.express(yunit)
@@ -1218,7 +1218,7 @@ class Plotter(Aggregator, BaseProcessor):
                     color = colors[nml]
                 except TypeError:
                     color = colors(nml)
-            if yerr is None:
+            if yerr is None or yerr_kind is None:
                 (base_line,) = plt.plot(x, y, label=label, color=color, **kwargs)
             else:
                 base_line, _, _ = plt.errorbar(