diff --git a/src/yunohost/utils/config.py b/src/yunohost/utils/config.py
index 6d3c322f2..4636eaf48 100644
--- a/src/yunohost/utils/config.py
+++ b/src/yunohost/utils/config.py
@@ -538,6 +538,8 @@ class TagsQuestion(Question):
         values = self.value
         if isinstance(values, str):
             values = values.split(",")
+        elif value is None:
+            values = []
         for value in values:
             self.value = value
             super()._prevalidate()