diff --git a/src/calibre/gui2/tweak_book/diff/view.py b/src/calibre/gui2/tweak_book/diff/view.py
index 3e84ec8dbd..359b0f7fb8 100644
--- a/src/calibre/gui2/tweak_book/diff/view.py
+++ b/src/calibre/gui2/tweak_book/diff/view.py
@@ -772,6 +772,7 @@ class DiffSplit(QSplitter):  # {{{
             if fmts:
                 block.layout().setAdditionalFormats(fmts)
     # }}}
+
 # }}}
 
 class DiffView(QWidget):  # {{{
diff --git a/src/calibre/gui2/tweak_book/editor/themes.py b/src/calibre/gui2/tweak_book/editor/themes.py
index 93aac36849..7b7c0b6559 100644
--- a/src/calibre/gui2/tweak_book/editor/themes.py
+++ b/src/calibre/gui2/tweak_book/editor/themes.py
@@ -233,5 +233,5 @@ def theme_color(theme, name, attr):
     try:
         return getattr(theme[name], attr).color()
     except (KeyError, AttributeError):
-        return getattr(THEMES[default_theme()], attr).color()
+        return getattr(THEMES[default_theme()][name], attr).color()