diff --git a/changelog.md b/changelog.md
index 62a85eb..06d81cf 100644
--- a/changelog.md
+++ b/changelog.md
@@ -928,3 +928,5 @@ index 465d4ad..aa8bad6 100644
 - GH-181 [BUG] xAxis: Date mismatch in combined charts. Especially when using cumulative aggregation. Feel free to comment if you have more infos, or also noticed this issue.
 
 # Next
+
+- Bugfix: Reason: '<' not supported between instances of 'NoneType' and 'float' in the skins/weewx-wdc/year-%Y.html.tmpl file GH-256
diff --git a/skins/weewx-wdc/includes/stat-table.inc b/skins/weewx-wdc/includes/stat-table.inc
index e56746b..b4fa589 100644
--- a/skins/weewx-wdc/includes/stat-table.inc
+++ b/skins/weewx-wdc/includes/stat-table.inc
@@ -80,9 +80,11 @@
               #set $stat_month = $get_stat_table_month_obs($time_span_start_ts, $time_span_end_ts)
               #set $raw_value = $getattr($getattr($stat_month, $stat_table_obs), $agg_for_value).raw
 
-              #silent $per_month[$month].append($raw_value)
-              #silent $per_year[$year].append($raw_value)
-              #silent $per_all.append($raw_value)
+              #if $raw_value is not None
+                #silent $per_month[$month].append($raw_value)
+                #silent $per_year[$year].append($raw_value)
+                #silent $per_all.append($raw_value)
+              #end if
 
               <bx-structured-list-cell data-testid="month-$month_from_range-$agg-$stat_table_obs">
                 $getattr($getattr($stat_month, $stat_table_obs), $agg_for_value)