diff --git a/pom.xml b/pom.xml
index 890e14e..783414e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
 
   <groupId>ru.simplex2</groupId>
   <artifactId>vkid_spring_security</artifactId>
-  <version>1.5-SNAPSHOT</version>
+  <version>1.6-SNAPSHOT</version>
 
   <name>vkid_spring_security</name>
   <description>A simple vkid_spring_security.</description>
diff --git a/src/main/java/ru/simplex2/vkid_spring_security/vk/VkEndAuthFilter.java b/src/main/java/ru/simplex2/vkid_spring_security/vk/VkEndAuthFilter.java
index 88be2c1..9457b2f 100644
--- a/src/main/java/ru/simplex2/vkid_spring_security/vk/VkEndAuthFilter.java
+++ b/src/main/java/ru/simplex2/vkid_spring_security/vk/VkEndAuthFilter.java
@@ -87,10 +87,20 @@
         userDataRequestBody.add("access_token", responseBodyMap.get("access_token"));
         HttpEntity<MultiValueMap<String, String>> userDataRequestEntity = new HttpEntity<>(userDataRequestBody, headers);
         ResponseEntity<Map> userDataResponseEntity = restTemplate.postForEntity("https://id.vk.ru/oauth2/user_info", userDataRequestEntity, Map.class);
-        Map<String, Object> userData = (Map<String, Object>) userDataResponseEntity.getBody().get("user");
+        Map responseData = userDataResponseEntity.getBody();
+        Map<String, Object> userData = (Map<String, Object>) responseData.get("user");
 
         if (userData == null) {
-            LOG.error("Response body returned from https://id.vk.ru/oauth2/user_info is null");
+            LOG.error("Key 'user' in response from 'https://id.vk.ru/oauth2/user_info' contains null value!");
+            if (responseData.get("error") != null) {
+                LOG.error("error : {}", responseData.get("error"));
+            }
+            if (responseData.get("error_description") != null) {
+                LOG.error("error_description : {}", responseData.get("error_description"));
+            }
+            if (responseData.get("state") != null) {
+                LOG.error("state : {}", responseData.get("state"));
+            }
             return null;
         }
         VkUser vkUser = createVkUser(userData);