diff --git a/src/hooks/module/useTrestle.js b/src/hooks/module/useTrestle.js
index 0f8c04d3..9e4415bd 100644
--- a/src/hooks/module/useTrestle.js
+++ b/src/hooks/module/useTrestle.js
@@ -819,7 +819,12 @@ export const useTrestle = () => {
 
   // 발전 시뮬레이션 용 각도 재계산
   const getAzimuth = (parent) => {
-    const { moduleCompass, surfaceCompass, direction } = parent
+    if (typeof parent === 'string') {
+      console.warn('getAzimuth: parent is string, expected object', parent);
+      return 0; // 또는 적절한 기본값
+    }
+
+    const { moduleCompass, surfaceCompass, direction } = parent || {};
 
     if (surfaceCompass) {
       return -surfaceCompass