diff --git a/td/telegram/ConfigManager.cpp b/td/telegram/ConfigManager.cpp
index 5b3f3c88..9360b5fb 100644
--- a/td/telegram/ConfigManager.cpp
+++ b/td/telegram/ConfigManager.cpp
@@ -367,6 +367,10 @@ class ConfigRecoverer : public Actor {
   }
 
   static bool check_phone_number_rules(Slice phone_number, Slice rules) {
+    if (rules.empty() || phone_number.empty()) {
+      return true;
+    }
+
     bool found = false;
     for (auto prefix : full_split(rules, ',')) {
       if (prefix.empty()) {
diff --git a/test/mtproto.cpp b/test/mtproto.cpp
index 620b4fa2..2663d972 100644
--- a/test/mtproto.cpp
+++ b/test/mtproto.cpp
@@ -43,7 +43,7 @@ TEST(Mtproto, config) {
     auto run = [&](auto &func, bool is_test) {
       auto promise = PromiseCreator::lambda([&, num = cnt](Result<SimpleConfig> r_simple_config) {
         if (r_simple_config.is_ok()) {
-          LOG(ERROR) << num << " " << to_string(r_simple_config.ok());
+          LOG(WARNING) << num << " " << to_string(r_simple_config.ok());
         } else {
           LOG(ERROR) << num << " " << r_simple_config.error();
         }