@@ -590,7 +590,7 @@ class Learner1D(BaseLearner):

         Returns

         -------

-        plot : `holoviews.Scatter`, `holoviews.Path`, or `holoviews.Overlay`

+        plot : `holoviews.Overlay`

             Plot of the evaluated data.

         """

         if scatter_or_line not in ("scatter", "line"):

@@ -600,13 +600,15 @@ class Learner1D(BaseLearner):

         xs, ys = zip(*sorted(self.data.items())) if self.data else ([], [])

         if scatter_or_line == "scatter":

             if self.vdim == 1:

-                p = hv.Scatter((xs, ys))

+                plots = [hv.Scatter((xs, ys))]

             else:

-                scatters = [hv.Scatter((xs, _ys)) for _ys in np.transpose(ys)]

-                p = hv.Overlay(scatters)

+                plots = [hv.Scatter((xs, _ys)) for _ys in np.transpose(ys)]

         else:

-            p = hv.Path((xs, ys))

+            plots = [hv.Path((xs, ys))]

+        # Put all plots in an Overlay because a DynamicMap can't handle changing

+        # datatypes, e.g. when `vdim` isn't yet known and the live_plot is running.

+        p = hv.Overlay(plots)

         # Plot with 5% empty margins such that the boundary points are visible

         margin = 0.05 * (self.bounds[1] - self.bounds[0])

         plot_bounds = (self.bounds[0] - margin, self.bounds[1] + margin)