diff --git a/src/components/simulator/Simulator.jsx b/src/components/simulator/Simulator.jsx
index d873049f..283bdbc8 100644
--- a/src/components/simulator/Simulator.jsx
+++ b/src/components/simulator/Simulator.jsx
@@ -226,7 +226,7 @@ export default function Simulator() {
               {/* 연간예측발전량 */}
               <div className="estimate-box">
                 <div className="estimate-tit">{getMessage('simulator.title.sub4')}</div>
-                <div className="estimate-name">{chartData[chartData.length - 1]}</div>
+                <div className="estimate-name">{chartData[chartData.length - 1] != null ? `${chartData[chartData.length - 1]} kWh` : ''}</div>
               </div>
             </div>
             <div className="estimate-list-wrap">
diff --git a/src/hooks/module/useTrestle.js b/src/hooks/module/useTrestle.js
index 71ee6123..b652492b 100644
--- a/src/hooks/module/useTrestle.js
+++ b/src/hooks/module/useTrestle.js
@@ -3291,6 +3291,7 @@ export const useTrestle = () => {
 
   // 가대 설치 완료 전,후 모든 surface의 isComplete를 변경
   const setAllModuleSurfaceIsComplete = (bool) => {
+    if (!canvas) return
     const surfaces = canvas.getObjects().filter((obj) => obj.name === POLYGON_TYPE.MODULE_SETUP_SURFACE)
     surfaces.forEach((surface) => {
       surface.isComplete = bool
@@ -3299,6 +3300,7 @@ export const useTrestle = () => {
 
   // 배치면 전체에 가대 설치 여부
   const isAllComplete = () => {
+    if (!canvas) return false
     const surfaces = canvas.getObjects().filter((obj) => obj.name === POLYGON_TYPE.MODULE_SETUP_SURFACE)
     if (surfaces.length === 0) {
       return false