diff --git a/nodes/widgets/ui_chart.js b/nodes/widgets/ui_chart.js
index 1e049be45..e5d916898 100644
--- a/nodes/widgets/ui_chart.js
+++ b/nodes/widgets/ui_chart.js
@@ -63,10 +63,12 @@ module.exports = function (RED) {
                 const ago = (removeOlder * removeOlderUnit) * 1000 // milliseconds ago
                 const cutOff = (new Date()).getTime() - ago
                 const filterFn = (msg) => {
-                    let timestamp = msg._datapoint.x
+                    // msg._datapoint may be a single point or, in the case of multiple series in one msg, an array
+                    // if it is an array then all the elements will have the same timestamp so use the first one
+                    let timestamp = Array.isArray(msg._datapoint) ? msg._datapoint[0]?.x : msg._datapoint.x
                     // is x already a millisecond timestamp?
-                    if (typeof (msg._datapoint.x) === 'string') {
-                        timestamp = (new Date(msg._datapoint.x)).getTime()
+                    if (typeof (timestamp) === 'string') {
+                        timestamp = (new Date(timestamp)).getTime()
                     }
                     return timestamp > cutOff
                 }
diff --git a/ui/src/widgets/ui-chart/UIChart.vue b/ui/src/widgets/ui-chart/UIChart.vue
index 4610161e9..9d98891fc 100644
--- a/ui/src/widgets/ui-chart/UIChart.vue
+++ b/ui/src/widgets/ui-chart/UIChart.vue
@@ -514,13 +514,14 @@ export default {
             // determine what type of msg we have
             if (Array.isArray(msg) && msg.length > 0) {
                 // we have received an array of messages (loading from stored history)
-                msg.forEach((m, i) => {
-                    const p = m.payload
-                    const d = m._datapoint // server-side we compute a chart friendly format
-                    const label = d.category
-                    if (label !== null && label !== undefined) {
-                        this.addPoints(p, d, label, options)
-                    }
+                msg.forEach((m) => {
+                    const datapoints = Array.isArray(m._datapoint) ? m._datapoint : [m._datapoint]
+                    datapoints.forEach((d) => {
+                        const label = d.category
+                        if (label !== null && label !== undefined) {
+                            this.addPoints(m.payload, d, label, options)
+                        }
+                    })
                 })
             } else if (Array.isArray(payload) && msg.payload.length > 0) {
                 // we have received a message with an array of data points