diff --git a/samples/unit-tests/series-treegraph/treegraph/demo.js b/samples/unit-tests/series-treegraph/treegraph/demo.js
index 83bee546f8a..5b46723d736 100644
--- a/samples/unit-tests/series-treegraph/treegraph/demo.js
+++ b/samples/unit-tests/series-treegraph/treegraph/demo.js
@@ -134,5 +134,17 @@ QUnit.test('Treegraph series',
             1,
             'CollapseButton should be visible when point is expanded (#19368).'
         );
+
+        series.update({
+            showInLegend: true,
+            legendSymbol: 'lineMarker'
+        });
+
+        assert.ok(
+            chart.series[0].legendItem.symbol.element &&
+            chart.series[0].legendItem.line.element,
+            `Legend symbol and line should be rendered when
+            legendSymbol is set to lineMarker (#19671).`
+        );
     }
 );
diff --git a/ts/Core/Legend/LegendSymbol.ts b/ts/Core/Legend/LegendSymbol.ts
index 84cab8eb2f6..2071814fc77 100644
--- a/ts/Core/Legend/LegendSymbol.ts
+++ b/ts/Core/Legend/LegendSymbol.ts
@@ -94,6 +94,7 @@ namespace LegendSymbol {
             options = this.options,
             symbolWidth = legend.symbolWidth,
             symbolHeight = legend.symbolHeight,
+            symbol = this.symbol || 'circle',
             generalRadius = symbolHeight / 2,
             renderer = this.chart.renderer,
             legendItemGroup = legendItem.group,
@@ -151,7 +152,7 @@ namespace LegendSymbol {
             );
 
             // Restrict symbol markers size
-            if ((this.symbol as any).indexOf('url') === 0) {
+            if (symbol.indexOf('url') === 0) {
                 markerOptions = merge(markerOptions, {
                     width: symbolHeight,
                     height: symbolHeight
@@ -161,7 +162,7 @@ namespace LegendSymbol {
 
             legendItem.symbol = legendSymbol = renderer
                 .symbol(
-                    this.symbol as any,
+                    symbol,
                     (symbolWidth / 2) - radius,
                     verticalCenter - radius,
                     2 * radius,
diff --git a/ts/Series/Treegraph/TreegraphSeries.ts b/ts/Series/Treegraph/TreegraphSeries.ts
index bc72d398521..a91d27cf0ab 100644
--- a/ts/Series/Treegraph/TreegraphSeries.ts
+++ b/ts/Series/Treegraph/TreegraphSeries.ts
@@ -532,40 +532,47 @@ class TreegraphSeries extends TreemapSeries {
         state?: StatesOptionsKey
     ): SVGAttributes {
         const series = this,
-            levelOptions =
+            levelOptions = point &&
                 (series.mapOptionsToLevel as any)[point.node.level || 0] || {},
-            options = point.options,
+            options = point && point.options,
             stateOptions =
                 (levelOptions.states &&
                     (levelOptions.states as any)[state as any]) ||
                 {};
-        point.options.marker = merge(
-            series.options.marker,
-            levelOptions.marker,
-            point.options.marker
-        );
+
+        if (point) {
+            point.options.marker = merge(
+                series.options.marker,
+                levelOptions.marker,
+                point.options.marker
+            );
+        }
+
         const linkColor = pick(
-                stateOptions.link && stateOptions.link.color,
-                options.link && options.link.color,
-                levelOptions.link && levelOptions.link.color,
+                stateOptions && stateOptions.link && stateOptions.link.color,
+                options && options.link && options.link.color,
+                levelOptions && levelOptions.link && levelOptions.link.color,
                 series.options.link && series.options.link.color
             ),
             linkLineWidth = pick(
-                stateOptions.link && stateOptions.link.lineWidth,
-                options.link && options.link.lineWidth,
-                levelOptions.link && levelOptions.link.lineWidth,
+                stateOptions && stateOptions.link && stateOptions.link.lineWidth,
+                options && options.link && options.link.lineWidth,
+                levelOptions && levelOptions.link && levelOptions.link.lineWidth,
                 series.options.link && series.options.link.lineWidth
             ),
             attribs = seriesProto.pointAttribs.call(series, point, state);
 
-        if (point.isLink) {
-            attribs.stroke = linkColor;
-            attribs['stroke-width'] = linkLineWidth;
-            delete attribs.fill;
-        }
-        if (!point.visible) {
-            attribs.opacity = 0;
+        if (point) {
+            if (point.isLink) {
+                attribs.stroke = linkColor;
+                attribs['stroke-width'] = linkLineWidth;
+                delete attribs.fill;
+            }
+            if (!point.visible) {
+                attribs.opacity = 0;
+            }
         }
+
         return attribs;
     }