diff --git a/compiler/src/compile_info.ts b/compiler/src/compile_info.ts
index 9c547e5..94b75bd 100644
--- a/compiler/src/compile_info.ts
+++ b/compiler/src/compile_info.ts
@@ -541,7 +541,7 @@ function checkNeedUpdateFiles(file: string, needUpdate: NeedUpdateFlag, alreadyC
       checkNeedUpdateFiles(value.children[i], needUpdate, alreadyCheckedFiles);
     }
   } else {
-    cache[file] = { mtimeMs, children: [], error: false };
+    cache[file] = { mtimeMs, children: [], parent: [], error: false };
     needUpdate.flag = true;
   }
 }
diff --git a/compiler/src/ets_checker.ts b/compiler/src/ets_checker.ts
index b1c2cc5..d986088 100644
--- a/compiler/src/ets_checker.ts
+++ b/compiler/src/ets_checker.ts
@@ -219,6 +219,7 @@ function createOrUpdateCache(resolvedModules: ts.ResolvedModuleFull[], containin
       if (value) {
         value.mtimeMs = mtimeMs;
         value.error = error;
+        value.parent = value.parent || [];
         value.parent.push(path.resolve(containingFile));
         value.parent = [...new Set(value.parent)];
       } else {