diff --git a/src/charts/chart.js b/src/charts/chart.js
index 5c5816c..7c2f1d6 100644
--- a/src/charts/chart.js
+++ b/src/charts/chart.js
@@ -358,7 +358,7 @@ function doHandleCrosshairMovement(point) {
             }
             const points = structuredClone(shape.getPoints());
             const lpbe = shape._model._linePointBeingEdited
-            points[lpbe] = point
+            points[lpbe===null?0:lpbe] = point
             // console.log('calling onDrag', points, shape)
             invokeCallbacks(shapeCallbacks[shapeId], 'onDrag', shapeId, shape, points)
         }
diff --git a/src/components/chart/RungBuilder.vue b/src/components/chart/RungBuilder.vue
index 6382f04..99dc911 100644
--- a/src/components/chart/RungBuilder.vue
+++ b/src/components/chart/RungBuilder.vue
@@ -263,7 +263,7 @@ function translateOnModel(shape) {
     const prev = getModelValue(oldModel)
     const cur = vectorize(getModelValue(model))
     const delta = vectorSub(cur, prev)
-    // console.log('delta', shape.id, prev, cur, delta)
+    // console.log('translateOnModel delta', shape.id, prev, cur, delta)
     let [a, b] = endpoints.value
     a = vectorize(a)
     if (!vectorIsZero(delta)) {