diff --git a/debian/changelog b/debian/changelog
index 1437df00d..05c91650c 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -134,6 +134,12 @@ yunohost (11.0.2) testing; urgency=low
 
  -- Alexandre Aubin <alex.aubin@mailoo.org>  Wed, 19 Jan 2022 20:52:39 +0100
 
+yunohost (4.4.2.1) stable; urgency=low
+
+  - [fix] bullseye migration: /opt may not exist ... (5fd74577)
+
+ -- Alexandre Aubin <alex.aubin@mailoo.org>  Thu, 11 Aug 2022 15:56:16 +0200
+
 yunohost (4.4.2) stable; urgency=low
 
   - Release as stable
diff --git a/src/migrations/0021_migrate_to_bullseye.py b/src/migrations/0021_migrate_to_bullseye.py
index 7577c852c..01b846573 100644
--- a/src/migrations/0021_migrate_to_bullseye.py
+++ b/src/migrations/0021_migrate_to_bullseye.py
@@ -27,9 +27,6 @@ logger = getActionLogger("yunohost.migration")
 N_CURRENT_DEBIAN = 10
 N_CURRENT_YUNOHOST = 4
 
-N_NEXT_DEBAN = 11
-N_NEXT_YUNOHOST = 11
-
 VENV_REQUIREMENTS_SUFFIX = ".requirements_backup_for_bullseye_upgrade.txt"
 
 
@@ -42,8 +39,11 @@ def _get_all_venvs(dir, level=0, maxlevel=3):
         maxlevel - the depth of the recursion
         level - do not edit this, used as an iterator
     """
-    # Using os functions instead of glob, because glob doesn't support hidden folders, and we need recursion with a fixed depth
+    if not os.path.exists(dir):
+        return []
+
     result = []
+    # Using os functions instead of glob, because glob doesn't support hidden folders, and we need recursion with a fixed depth
     for file in os.listdir(dir):
         path = os.path.join(dir, file)
         if os.path.isdir(path):