diff --git a/superset/viz.py b/superset/viz.py
index f27406b75..dee7e560d 100644
--- a/superset/viz.py
+++ b/superset/viz.py
@@ -2036,6 +2036,7 @@ class BaseDeckGLViz(BaseViz):
         if fd.get('js_columns'):
             gb += fd.get('js_columns')
         metrics = self.get_metrics()
+        gb = list(set(gb))
         if metrics:
             d['groupby'] = gb
             d['metrics'] = self.get_metrics()