diff --git a/pmodules_tools/db_diff/check.py b/pmodules_tools/db_diff/check.py
index 665275cd..4a135e7f 100644
--- a/pmodules_tools/db_diff/check.py
+++ b/pmodules_tools/db_diff/check.py
@@ -12,12 +12,15 @@ from pytablewriter import AsciiDocTableWriter
 def asciidoc_json_dump(list, name, steps, Pmodules_db_path):
     matrix = []
     matrix_db = []
+    temp_matrix_db = []
 
     # Check the existing database
     db_file = os.path.join(Pmodules_db_path, name + "_modules.json")
     if os.path.exists(db_file):
-        with open(db_file, "r") as f:
-            matrix_db = json.load(f)
+        # No need to append the old database if we check the whole database
+        if name != "all":
+            with open(db_file, "r") as f:
+                matrix_db = json.load(f)
         temp_matrix_db = matrix_db.copy()
         for elem in matrix_db:
             if (