diff --git a/Dockerfile b/Dockerfile
index 5babf6988..99faa067e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,7 +3,7 @@
 # Requires Docker v17.05
 
 # Base image for build and runtime
-FROM python:3.7-slim-stretch AS base
+FROM python:3.8.0a4-stretch AS base
 LABEL maintainer="Eric Ho <dho.eric@gmail.com>"
 
 WORKDIR /usr/src/app
@@ -40,7 +40,7 @@ FROM base AS run
 
 # Copy from build image
 COPY --from=build /usr/src/app/ /usr/src/app/
-COPY --from=build /usr/local/lib/python3.7/ /usr/local/lib/python3.7/
+COPY --from=build /usr/local/lib/python3.8/ /usr/local/lib/python3.8/
 COPY --from=build /usr/local/bin/quokka /usr/local/bin/quokka
 
 WORKDIR /usr/src/app/quokka/project_template
diff --git a/quokka/admin/wtforms_html5.py b/quokka/admin/wtforms_html5.py
index ccc3a1c09..85e01933f 100644
--- a/quokka/admin/wtforms_html5.py
+++ b/quokka/admin/wtforms_html5.py
@@ -195,7 +195,7 @@ def set_title(field, render_kw=None):
     """
     if render_kw is None:
         render_kw = {}
-    if 'title' not in render_kw and getattr(field, 'description'):
+    if 'title' not in render_kw and getattr(field, 'description', None):
         render_kw['title'] = '{}'.format(field.description)
     return render_kw
 
diff --git a/quokka/core/content/models.py b/quokka/core/content/models.py
index 6d2fcc4d9..5358ed079 100644
--- a/quokka/core/content/models.py
+++ b/quokka/core/content/models.py
@@ -230,13 +230,13 @@ def metadata(self):
         # TODO: get metadata from database
         # TODO: implement libratar/gravatar
         # return {
-            # 'cover': 'foo',
-            # 'author_gravatar': 'http://i.pravatar.cc/300',
-            # 'about_author': 'About Author',
-            # 'translations': ['en'],
-            # 'og_image': 'foo',
-            # 'series': 'aa',
-            # 'asides': 'aaa'
+        # 'cover': 'foo',
+        # 'author_gravatar': 'http://i.pravatar.cc/300',
+        # 'about_author': 'About Author',
+        # 'translations': ['en'],
+        # 'og_image': 'foo',
+        # 'series': 'aa',
+        # 'asides': 'aaa'
         # }
         data = {}
         data.update(custom_var_dict(self.data.get('custom_vars')))
diff --git a/quokka/core/content/utils.py b/quokka/core/content/utils.py
index 57aaef312..d4c5ff1e7 100644
--- a/quokka/core/content/utils.py
+++ b/quokka/core/content/utils.py
@@ -10,10 +10,12 @@ def url_for_content(content, include_ext=True):
     else:
         data = content
 
+    category_slug_data = data.get('category_slug')
+    category_data = slugify_category(data.get('category') or '')
     category_slug = (
-        data.get('category_slug') or
-        slugify_category(data.get('category') or '')
+        category_slug_data or category_data
     )
+
     slug = data.get('slug') or slugify(data.get('title'))
 
     if category_slug:
diff --git a/quokka/core/content/views.py b/quokka/core/content/views.py
index 74c72d288..08d6d9bc1 100644
--- a/quokka/core/content/views.py
+++ b/quokka/core/content/views.py
@@ -255,6 +255,8 @@ def render_rss(self, content_type, templates, **context):
 
         for content in contents:
             content = make_model(content)
+            content_data = content.title.encode('utf-8')
+            content_data += content.url.encode('utf-8')
 
             if content.date > rss_pubdate:
                 rss_pubdate = content.date
@@ -267,8 +269,7 @@ def render_rss(self, content_type, templates, **context):
                     author=str(content.author),
                     categories=[str(content.tags)],
                     guid=hashlib.sha1(
-                        content.title.encode('utf-8') +
-                        content.url.encode('utf-8')
+                        content_data
                     ).hexdigest(),
                     pubDate=content.date,
                 )
diff --git a/quokka/core/db.py b/quokka/core/db.py
index 431c55aea..afc09ad77 100644
--- a/quokka/core/db.py
+++ b/quokka/core/db.py
@@ -183,17 +183,14 @@ def page_set(self, *args, **kwargs):
         return self.content_set(*args, **kwargs)
 
     def block_set(self, *args, **kwargs):
-            kwargs.setdefault(
-                'sort',
-                self.app.theme_context.get(
-                    'BLOCK_ORDER_BY', [('title', -1)]
-                )
-            )
-            if not args:
-                args = [{'content_type': 'block'}]
-            elif isinstance(args[0], dict):
-                args[0]['content_type'] = 'block'
-            return self.content_set(*args, **kwargs)
+        kwargs.setdefault('sort', self.app.theme_context.get(
+            'BLOCK_ORDER_BY', [('title', -1)]
+        ))
+        if not args:
+            args = [{'content_type': 'block'}]
+        elif isinstance(args[0], dict):
+            args[0]['content_type'] = 'block'
+        return self.content_set(*args, **kwargs)
 
     def select(self, colname, *args, **kwargs):
         return self.get_collection(colname).find(*args, **kwargs)
diff --git a/quokka/core/views/sitemap.py b/quokka/core/views/sitemap.py
index 871372817..2cdca943b 100644
--- a/quokka/core/views/sitemap.py
+++ b/quokka/core/views/sitemap.py
@@ -11,12 +11,12 @@ def get_contents(self):
         TODO: Should include extra paths, fixed paths
         config based paths, static paths
         """
+        content = self.get_index() + self.get_categories()
+        content += self.get_tags() + self.get_authors()
+        content += self.get_articles_and_pages()
+
         return (
-            self.get_index() +
-            self.get_categories() +
-            self.get_tags() +
-            self.get_authors() +
-            self.get_articles_and_pages()
+            content
         )
 
     def get_index(self):
diff --git a/quokka/utils/upload.py b/quokka/utils/upload.py
index 251e1c50f..bc8042679 100644
--- a/quokka/utils/upload.py
+++ b/quokka/utils/upload.py
@@ -9,7 +9,7 @@
 
 def dated_path(obj, file_data):
     try:
-        prefix = getattr(obj, 'model_name')
+        prefix = getattr(obj, 'model_name', None)
     except BaseException:
         prefix = "undefined"