diff --git a/pylossless/dash/topo_viz.py b/pylossless/dash/topo_viz.py
index 3cf1af2..ca0c9cc 100644
--- a/pylossless/dash/topo_viz.py
+++ b/pylossless/dash/topo_viz.py
@@ -659,7 +659,6 @@ def initialize_layout(self, slider_val=None, show_sensors=True):
         # of the channels are compatible between plot_data and the montage
         montage = pick_montage(self.montage, self.data.topo_values.columns)
         ch_names = montage.ch_names
-        assert len(ch_names) == len(self.data.topo_values.columns)
         plot_data = [
             OrderedDict(self.data.topo_values.loc[title, ch_names]) for title in titles
         ]