diff --git a/plugins/generic/users.py b/plugins/generic/users.py
index 1e7043c53..a65f51331 100644
--- a/plugins/generic/users.py
+++ b/plugins/generic/users.py
@@ -103,7 +103,9 @@ class Users:
             if not isNoneValue(values):
                 kb.data.cachedUsers = []
                 for value in arrayizeValue(values):
-                    kb.data.cachedUsers.append(unArrayizeValue(value))
+                    value = unArrayizeValue(value)
+                    if not isNoneValue(value):
+                        kb.data.cachedUsers.append(value)
 
         if not kb.data.cachedUsers and isInferenceAvailable() and not conf.direct:
             infoMsg = "fetching number of database users"