diff --git a/src/hooks/roofcover/useAuxiliaryDrawing.js b/src/hooks/roofcover/useAuxiliaryDrawing.js
index c854ae77..aad5a715 100644
--- a/src/hooks/roofcover/useAuxiliaryDrawing.js
+++ b/src/hooks/roofcover/useAuxiliaryDrawing.js
@@ -710,9 +710,34 @@ export function useAuxiliaryDrawing(id, isUseEffect = true) {
 
       //보조선과 만나는 점을 찾는다.
       innerLines.forEach((line2) => {
+        // line1이 canvas에 없는 경우 return
+        if (!canvas.getObjects().includes(line1)) {
+          return
+        }
+
         if (line1 === line2) {
           return
         }
+        // const originLine1 = {
+        //   stroke : line1.stroke,
+        //   strokeWidth: line1.strokeWidth
+        // }
+        // const originLine2 = {
+        //   stroke: line2.stroke,
+        //   strokeWidth: line2.strokeWidth
+        // }
+        // line1.set({stroke: 'red', strokeWidth: 10})
+        // line2.set({stroke: 'blue', strokeWidth: 10})
+        //
+        // canvas.renderAll()
+        //
+        // debugger
+        //
+        // line1.set(originLine1)
+        // line2.set(originLine2)
+        // canvas.renderAll()
+
+
         const intersectionPoint = calculateIntersection(line1, line2)
         if (!intersectionPoint) {
           return
@@ -723,7 +748,7 @@ export function useAuxiliaryDrawing(id, isUseEffect = true) {
         const distance1 = distanceBetweenPoints({ x: line1.x1, y: line1.y1 }, intersectionPoint)
         const distance2 = distanceBetweenPoints({ x: line1.x2, y: line1.y2 }, intersectionPoint)
 
-        if (distance1 < 1 || distance2 < 1) {
+        if (distance1 < 2 || distance2 < 2) {
           return
         }
         //historyLine에서 기존 line을 제거한다.