diff --git a/html4docx/h4d.py b/html4docx/h4d.py
index 5184e16..e1dd1e8 100644
--- a/html4docx/h4d.py
+++ b/html4docx/h4d.py
@@ -1295,8 +1295,14 @@ def handle_table(self, current_attrs):
 
                 # Reference:
                 # https://python-docx.readthedocs.io/en/latest/dev/analysis/features/table/cell-merge.html
-                rowspan = int(col.get('rowspan', 1))
-                colspan = int(col.get('colspan', 1))
+                try:
+                    rowspan = int(col.get('rowspan', 1))
+                except ValueError:
+                    rowspan = 1
+                try:
+                    colspan = int(col.get('colspan', 1))
+                except ValueError:
+                    colspan = 1
 
                 if rowspan > 1 or colspan > 1:
                     docx_cell = docx_cell.merge(
diff --git a/tests/test_h4d.py b/tests/test_h4d.py
index 8b510a9..5e851c0 100644
--- a/tests/test_h4d.py
+++ b/tests/test_h4d.py
@@ -2573,5 +2573,15 @@ def test_invalid_color_fallback_to_black(self):
         self.assertIn('Could not parse color \'invalidcolorname\': Invalid color value. Fallback to black.', log.output[3])
         self.assertIn('Could not parse color \'#f7272626161\': Invalid color value. Fallback to black.', log.output[4])
 
+    def test_invalid_rowspan_and_colspan(self):
+        """Test with invalid rowspan and colspan"""
+        self.document.add_heading("Test: Test invalid rowspan and colspan", level=1)
+        html = '<table><tr><td rowspan="invalid">Test</td></tr></table>'
+
+        doc = Document()
+        parser = HtmlToDocx()
+        parser.add_html_to_document(html, self.document)
+        parser.add_html_to_document(html, doc)
+
 if __name__ == "__main__":
     unittest.main()