diff --git a/src/hooks/module/useTrestle.js b/src/hooks/module/useTrestle.js
index 2b35aaf6..73fca74e 100644
--- a/src/hooks/module/useTrestle.js
+++ b/src/hooks/module/useTrestle.js
@@ -605,7 +605,7 @@ export const useTrestle = () => {
     } catch (e) {
       // 에러 발생시 가대 초기화
       console.error(e)
-      // clear()
+      clear()
       setViewCircuitNumberTexts(true)
       setIsGlobalLoading(false)
       return false
@@ -988,12 +988,20 @@ export const useTrestle = () => {
     return result
   }
 
+  // rack을 그린다.
   const drawRacks = (rackInfos, rackQty, rackIntvlPct, module, direction, l, rackYn) => {
-    if (!rackInfos) {
-      return
-    }
     const { width, height, left, top, lastX, lastY, surfaceId } = module
     const surface = canvas.getObjects().find((obj) => obj.id === surfaceId)
+    if (!rackInfos) {
+      const maxRows = surface.trestleDetail.moduleMaxRows
+      const maxCols = surface.trestleDetail.moduleMaxCols
+      const msg = `選択した家で設置可能
+モジュールの最大段数は${maxRows}、最大列数は${maxCols}です。
+上限より上部に取り付けたモジュールを削除してください。`
+      swalFire({ title: msg, type: 'alert' })
+      throw new Error('rackInfos is null')
+    }
+
     const roof = canvas.getObjects().find((obj) => obj.id === surface.parentId)
     const degree = getDegreeByChon(roof.roofMaterial.pitch)