diff --git a/src/modules/Markers.js b/src/modules/Markers.js
index 0a098a1fd..88cf80c5c 100644
--- a/src/modules/Markers.js
+++ b/src/modules/Markers.js
@@ -68,6 +68,15 @@ export default class Markers {
 
     if (Array.isArray(p.x)) {
       for (let q = 0; q < p.x.length; q++) {
+        if (
+          p.x[q] < 0 ||
+          p.x[q] > w.globals.gridWidth ||
+          p.y[q] < 0 ||
+          p.y[q] > w.globals.gridHeight
+        ) {
+          continue
+        }
+
         let dataPointIndex = j
 
         // a small hack as we have 2 points for the first val to connect it