diff --git a/covid.js b/covid.js
index cfaf278501f7f84ddb07a70686ec44c9754bc370..9000aabedb2542c5f94be757845ee91adf393dc3 100644
--- a/covid.js
+++ b/covid.js
@@ -1616,6 +1616,10 @@ let updateChartSettings = () => {
         theChart.data.new_datasets.forEach((el, idx)=>{
             theChart.data.datasets[idx + 3] = theChart.data.new_datasets[idx]
         })
+        // remove any "extra" datasets
+        for (var i=0; (theChart.data.new_datasets.length + 3)<theChart.data.datasets.length; i++) {
+            theChart.data.datasets.pop()
+        }
         // update the chart
         theChart.update();
     } catch (e) {}