diff --git a/src/util/qpolygon-utils.js b/src/util/qpolygon-utils.js
index 7d234010..482693dc 100644
--- a/src/util/qpolygon-utils.js
+++ b/src/util/qpolygon-utils.js
@@ -311,8 +311,6 @@ export function removeDuplicatePolygons(polygons, hasAuxiliaryLine = false) {
   //   return isValidPoints(polygon)
   // })
 
-  console.log('uniquePolygons2', uniquePolygons)
-
   return uniquePolygons
 }
 
@@ -373,6 +371,14 @@ function checkPolygonSelfIntersection(coordinates) {
     }
   }
 
+  // 모든 점이 같은 직선상에 있는지 검사 (degenerate polygon)
+  const allSameX = coordinates.every((point) => point.x === coordinates[0].x)
+  const allSameY = coordinates.every((point) => point.y === coordinates[0].y)
+
+  if (allSameX || allSameY) {
+    return true // 직선상의 점들은 유효하지 않은 다각형이므로 true 반환
+  }
+
   const intersections = []
   const edges = []