diff --git a/dataframe_image/converter/matplotlib_table.py b/dataframe_image/converter/matplotlib_table.py
index ada0a9f..8829040 100644
--- a/dataframe_image/converter/matplotlib_table.py
+++ b/dataframe_image/converter/matplotlib_table.py
@@ -144,7 +144,7 @@ def parse_row(row):
             for row in tbody.findall(".//tr"):
                 rows.append(parse_row(row))
 
-        if not thead and not tbody:
+        if thead is None and tbody is None:
             for row in tree.findall(".//tr"):
                 rows.append(parse_row(row))