diff --git a/scripts/tools/memory/gh_report.py b/scripts/tools/memory/gh_report.py
index 0e949134b1f5db..c35c3e53840be4 100755
--- a/scripts/tools/memory/gh_report.py
+++ b/scripts/tools/memory/gh_report.py
@@ -375,7 +375,8 @@ def merge(df: pd.DataFrame, comment) -> pd.DataFrame:
                     cols, rows = memdf.util.markdown.read_hierified(body)
                     break
         logging.debug('REC: read %d rows', len(rows))
-        df = df.append(pd.DataFrame(data=rows, columns=cols).astype(df.dtypes))
+        df = pd.concat([df, pd.DataFrame(data=rows, columns=cols).astype(df.dtypes)],
+                       ignore_index=True)
         return df.sort_values(
             by=['platform', 'target', 'config', 'section']).drop_duplicates()
 
diff --git a/scripts/tools/memory/memdf/util/markdown.py b/scripts/tools/memory/memdf/util/markdown.py
index 52aea03e86db91..d738059decec8f 100644
--- a/scripts/tools/memory/memdf/util/markdown.py
+++ b/scripts/tools/memory/memdf/util/markdown.py
@@ -34,7 +34,7 @@ def read_hierified(f):
         for i in range(0, len(header)):
             column = columns[i + 1].strip()
             if not column:
-                column = rows[-1][i]
+                column = rows[-1][i] if rows else '(blank)'
             row.append(column)
         rows.append(tuple(row))