2 files changed, 6 insertions, 2 deletions
diff --git a/vhosts/blog/nuldoc-src/ndoc/parse.ts b/vhosts/blog/nuldoc-src/ndoc/parse.ts
index d1557750..1ffa7413 100644
--- a/vhosts/blog/nuldoc-src/ndoc/parse.ts
+++ b/vhosts/blog/nuldoc-src/ndoc/parse.ts
@@ -21,7 +21,9 @@ export async function parseNulDocFile(
     const doc = createNewDocumentFromRootElement(root, meta, filePath, config);
     return toHtml(doc);
   } catch (e) {
-    e.message = `${e.message} in ${filePath}`;
+    if (e instanceof Error) {
+      e.message = `${e.message} in ${filePath}`;
+    }
     throw e;
   }
 }
diff --git a/vhosts/blog/nuldoc-src/slide/parse.ts b/vhosts/blog/nuldoc-src/slide/parse.ts
index 82510a95..7ba17cb0 100644
--- a/vhosts/blog/nuldoc-src/slide/parse.ts
+++ b/vhosts/blog/nuldoc-src/slide/parse.ts
@@ -29,7 +29,9 @@ export async function parseSlideFile(
     );
     return createNewSlideFromTomlRootObject(root, filePath, config);
   } catch (e) {
-    e.message = `${e.message} in ${filePath}`;
+    if (e instanceof Error) {
+      e.message = `${e.message} in ${filePath}`;
+    }
     throw e;
   }
 }