diff --git a/src/userdb/userdbctl.c b/src/userdb/userdbctl.c
index f98acce29e..761f172682 100644
--- a/src/userdb/userdbctl.c
+++ b/src/userdb/userdbctl.c
@@ -310,6 +310,9 @@ static int table_add_uid_map(
         assert(table);
         assert(add_unavailable);
 
+        if (!p)
+                return 0;
+
         for (size_t i = 0; p && i < p->n_entries; i++) {
                 UIDRangeEntry *x = p->entries + i;