diff --git a/joplinexport b/joplinexport
index a7c5118..795f9db 100755
--- a/joplinexport
+++ b/joplinexport
@@ -304,7 +304,8 @@ class JoplinExporter:
         with (self.content_dir / "SUMMARY.md").open("w") as outfile:
             outfile.write("# Summary\n\n")
             # Special-case the introduction.
-            outfile.write(introduction.get_summary_line(0) + "\n")
+            if introduction:
+                outfile.write(introduction.get_summary_line(0) + "\n")
             outfile.write("\n".join(items))
 
     def export(self):
@@ -318,12 +319,12 @@ class JoplinExporter:
         for folder in folder_list:
             contents = []
             dir = self.content_dir / folder.get_url()
-            dir.mkdir(parents=True)
+            dir.mkdir(parents=True, exist_ok=True)
             for note in sorted(self.notes[folder.id], key=lambda n: n.title):
                 print(f"Exporting {folder.title} - {note.title}...")
                 contents.append((note.title, f"{note.get_url()}.html"))
                 with (self.content_dir / (note.get_url() + ".md")).open(
-                    mode="w"
+                    mode="w", encoding="utf-8"
                 ) as outfile:
                     outfile.write(
                         f"""# {note.title}