diff --git a/src/Dictionaries/DictionaryStructure.cpp b/src/Dictionaries/DictionaryStructure.cpp
index 25e29d7e0e8..166f33b9a00 100644
--- a/src/Dictionaries/DictionaryStructure.cpp
+++ b/src/Dictionaries/DictionaryStructure.cpp
@@ -241,6 +241,8 @@ const DictionaryAttribute & DictionaryStructure::getAttribute(const std::string
         for (const auto & key_attribute : *key)
             if (key_attribute.name == attribute_name)
                 return key_attribute;
+
+        throw Exception{"No such attribute '" + attribute_name + "'", ErrorCodes::BAD_ARGUMENTS};
     }
 
     size_t attribute_index = it->second;
diff --git a/tests/queries/0_stateless/01018_ip_dictionary.sql b/tests/queries/0_stateless/01018_ip_dictionary.sql
index 5df1afcd559..2abd51cc9fe 100644
--- a/tests/queries/0_stateless/01018_ip_dictionary.sql
+++ b/tests/queries/0_stateless/01018_ip_dictionary.sql
@@ -41,6 +41,9 @@ SOURCE(CLICKHOUSE(host 'localhost' port 9000 user 'default' db 'database_for_dic
 LAYOUT(IP_TRIE())
 LIFETIME(MIN 10 MAX 100);
 
+-- fuzzer
+SELECT '127.0.0.0/24' = dictGetString('database_for_dict.dict_ipv4_trie', 'prefixprefixprefixprefix', tuple(IPv4StringToNum('127.0.0.0127.0.0.0'))); -- { serverError 36 }
+
 SELECT 0 == dictGetUInt32('database_for_dict.dict_ipv4_trie', 'asn', tuple(IPv4StringToNum('0.0.0.0')));
 SELECT 1 == dictGetUInt32('database_for_dict.dict_ipv4_trie', 'asn', tuple(IPv4StringToNum('128.0.0.0')));
 SELECT 2 == dictGetUInt32('database_for_dict.dict_ipv4_trie', 'asn', tuple(IPv4StringToNum('192.0.0.0')));