diff --git a/Makefile b/Makefile
index 59102b7..d6efb00 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@ MYSQL_PORT ?= 3306
 MYSQL_PASS ?= "123456"
 POSTGRES_HOST ?= "127.0.0.1"
 POSTGRES_PORT ?= 5432
-POSTGRES_PAS ?= "123456"
+POSTGRES_PASS ?= "123456"
 
 help:
 	@echo "Aerich development makefile"
diff --git a/aerich/cli.py b/aerich/cli.py
index ae50eb5..38b0211 100644
--- a/aerich/cli.py
+++ b/aerich/cli.py
@@ -262,7 +262,9 @@ async def init_db(ctx: Context, safe):
         os.mkdir(dirname)
         click.secho(f"Success create app migrate location {dirname}", fg=Color.green)
     else:
-        return click.secho(f"Inited {app} already", fg=Color.yellow)
+        return click.secho(
+            f"Inited {app} already, or delete {dirname} and try again.", fg=Color.yellow
+        )
 
     await Tortoise.init(config=config)
     connection = get_app_connection(config, app)
diff --git a/aerich/migrate.py b/aerich/migrate.py
index 98d67c4..60d23aa 100644
--- a/aerich/migrate.py
+++ b/aerich/migrate.py
@@ -312,7 +312,11 @@ class Migrate:
                         else:
                             is_rename = diff_key in cls._rename_new
                         if is_rename:
-                            if cls.dialect == "mysql" and cls._db_version.major == 5:
+                            if (
+                                cls.dialect == "mysql"
+                                and cls._db_version
+                                and cls._db_version.major == 5
+                            ):
                                 cls._add_operator(
                                     cls._change_field(new_model, old_field, new_field),
                                     upgrade,