diff --git a/src/calibre/ebooks/docx/writer/styles.py b/src/calibre/ebooks/docx/writer/styles.py
index 6a29b21403..e6c4f302d8 100644
--- a/src/calibre/ebooks/docx/writer/styles.py
+++ b/src/calibre/ebooks/docx/writer/styles.py
@@ -405,8 +405,11 @@ class BlockStyle(DOCXStyle):
             except (TypeError, ValueError):
                 self.line_height = max(0, int(1.2 * css.fontSize * 20))
             self.background_color = None if is_table_cell else convert_color(css['background-color'])
-            self.text_align = {'start':'left', 'left':'left', 'end':'right', 'right':'right', 'center':'center', 'justify':'both', 'centre':'center'}.get(
-                css['text-align'].lower(), 'left')
+            try:
+                self.text_align = {'start':'left', 'left':'left', 'end':'right', 'right':'right', 'center':'center', 'justify':'both', 'centre':'center'}.get(
+                    css['text-align'].lower(), 'left')
+            except AttributeError:
+                self.text_align = 'left'
 
         DOCXStyle.__init__(self, namespace)
 
diff --git a/src/calibre/ebooks/docx/writer/tables.py b/src/calibre/ebooks/docx/writer/tables.py
index 9fb9389763..f2e40193e0 100644
--- a/src/calibre/ebooks/docx/writer/tables.py
+++ b/src/calibre/ebooks/docx/writer/tables.py
@@ -301,8 +301,8 @@ class Table(object):
                         except Exception:
                             tcell = None
                         if tcell is None:
-                            nrow.extend([SpannedCell(nrow[-1], horizontal=True) for i in xrange(idx - len(nrow))])
-                            nrow.append(sc)
+                            nrow.cells.extend([SpannedCell(nrow.cells[-1], horizontal=True) for i in xrange(idx - len(nrow.cells))])
+                            nrow.cells.append(sc)
                         else:
                             if isinstance(tcell, SpannedCell):
                                 # Conflict between rowspan and colspan