diff --git a/src/hooks/useLine.js b/src/hooks/useLine.js
index b447d4f0..21fd9aa5 100644
--- a/src/hooks/useLine.js
+++ b/src/hooks/useLine.js
@@ -53,8 +53,8 @@ export const useLine = () => {
     })
     canvas
       ?.getObjects()
-      .find((obj) => obj.parentId === line.id)
-      .set({
+      ?.find((obj) => obj.parentId === line.id)
+      ?.set({
         visible: true,
       })
     canvas?.renderAll()
diff --git a/src/util/qpolygon-utils.js b/src/util/qpolygon-utils.js
index 34bc2320..2705b546 100644
--- a/src/util/qpolygon-utils.js
+++ b/src/util/qpolygon-utils.js
@@ -3527,7 +3527,7 @@ export const calcLinePlaneSize = (points) => {
  * @param degree
  * @returns number
  */
-export const calcLineActualSize = (points, degree) => {
+export const calcLineActualSize = (points, degree = 0) => {
   const { x1, y1, x2, y2 } = points
   const planeSize = calcLinePlaneSize(points)
   let height = Big(Math.tan(Big(degree).times(Math.PI / 180))).times(planeSize)