diff --git a/popmon/visualization/histogram_section.py b/popmon/visualization/histogram_section.py
index 7351544c..cb5abe03 100644
--- a/popmon/visualization/histogram_section.py
+++ b/popmon/visualization/histogram_section.py
@@ -250,9 +250,9 @@ def _plot_histograms(feature, date, hc_list, hist_names, top_n, max_nbins=1000):
             hists, feature, hist_names, y_label, is_num, is_ts
         )
     elif hc_list[0].n_dim == 2:
-        plot = ""
+        plot = {"plot": ""}
     else:
-        plot = ""
+        plot = {"plot": ""}
 
     return {
         "name": date,