diff --git a/table_multi_markdown_syntax.py b/table_multi_markdown_syntax.py
index 8a48f89..f60c73a 100644
--- a/table_multi_markdown_syntax.py
+++ b/table_multi_markdown_syntax.py
@@ -115,6 +115,8 @@ def is_align(self):
 class MultiMarkdownTableParser(tbase.BaseTableParser):
 
     def _is_multi_markdown_align_row(self, str_cols):
+        if len(str_cols) == 0:
+            return False
         for col in str_cols:
             if not MultiMarkdownAlignColumn.match_cell(col):
                 return False
diff --git a/table_simple_syntax.py b/table_simple_syntax.py
index adc8457..8662e6b 100644
--- a/table_simple_syntax.py
+++ b/table_simple_syntax.py
@@ -100,6 +100,8 @@ def is_align(self):
 class SimpleTableParser(tborder.BorderTableParser):
 
     def _is_custom_align_row(self, str_cols):
+        if len(str_cols) == 0:
+            return False
         for col in str_cols:
             if not CustomAlignColumn.match_cell(col):
                 return False