keycloak-uncached

diff --git a/services/src/main/java/org/keycloak/services/resources/TokenService.java b/services/src/main/java/org/keycloak/services/resources/TokenService.java
index 024bdb7..b0f5f4a 100755
--- a/services/src/main/java/org/keycloak/services/resources/TokenService.java
+++ b/services/src/main/java/org/keycloak/services/resources/TokenService.java
@@ -241,7 +241,7 @@ public class TokenService {
         audit.detail(Details.USERNAME, username);
 
         UserModel user = realm.getUser(username);
-        audit.user(user);
+        if (user != null) audit.user(user);
 
         ClientModel client = authorizeClient(authorizationHeader, form, audit);
 

diff --git a/testsuite/integration/src/test/java/org/keycloak/testsuite/adapter/AdapterTest.java b/testsuite/integration/src/test/java/org/keycloak/testsuite/adapter/AdapterTest.java
index d478a1e..46e8b2f 100755
--- a/testsuite/integration/src/test/java/org/keycloak/testsuite/adapter/AdapterTest.java
+++ b/testsuite/integration/src/test/java/org/keycloak/testsuite/adapter/AdapterTest.java
@@ -21,6 +21,7 @@
  */
 package org.keycloak.testsuite.adapter;
 
+import org.jboss.resteasy.util.BasicAuthHelper;
 import org.junit.Assert;
 import org.junit.ClassRule;
 import org.junit.Rule;
@@ -52,11 +53,14 @@ import org.openqa.selenium.WebDriver;
 
 import javax.ws.rs.client.Client;
 import javax.ws.rs.client.ClientBuilder;
+import javax.ws.rs.client.Entity;
 import javax.ws.rs.client.WebTarget;
+import javax.ws.rs.core.Form;
 import javax.ws.rs.core.GenericType;
 import javax.ws.rs.core.HttpHeaders;
 import javax.ws.rs.core.Response;
 import javax.ws.rs.core.UriBuilder;
+import java.net.URI;
 import java.net.URL;
 import java.security.PublicKey;
 import java.util.Map;
@@ -299,4 +303,28 @@ public class AdapterTest {
         client.close();
 
     }
+
+    /**
+     * KEYCLOAK-518
+     * @throws Exception
+     */
+    @Test
+    public void testBadUser() throws Exception {
+        Client client = ClientBuilder.newClient();
+        UriBuilder builder = UriBuilder.fromUri(org.keycloak.testsuite.Constants.AUTH_SERVER_ROOT);
+        URI uri = TokenService.grantAccessTokenUrl(builder).build("demo");
+        WebTarget target = client.target(uri);
+        String header = BasicAuthHelper.createHeader("customer-portal", "password");
+        Form form = new Form();
+        form.param("username", "monkey@redhat.com")
+            .param("password", "password");
+        Response response = target.request()
+                .header(HttpHeaders.AUTHORIZATION, header)
+                .post(Entity.form(form));
+        Assert.assertEquals(400, response.getStatus());
+        response.close();
+        client.close();
+
+    }
+
 }

diff --git a/testsuite/integration/src/test/resources/adapter-test/demorealm.json b/testsuite/integration/src/test/resources/adapter-test/demorealm.json
index d739592..d27b3ec 100755
--- a/testsuite/integration/src/test/resources/adapter-test/demorealm.json
+++ b/testsuite/integration/src/test/resources/adapter-test/demorealm.json
@@ -7,6 +7,7 @@
     "sslNotRequired": true,
     "registrationAllowed": false,
     "social": false,
+    "passwordCredentialGrantAllowed": true,
     "updateProfileOnInitialSocialLogin": false,
     "privateKey": "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",
     "publicKey": "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCrVrCuTtArbgaZzL1hvh0xtL5mc7o0NqPVnYXkLvgcwiC3BjLGw1tGEGoJaXDuSaRllobm53JBhjx33UNv+5z/UMG4kytBWxheNVKnL6GgqlNabMaFfPLPCF8kAgKnsi79NMo+n6KnSY8YeUmec/p2vjO2NjsSAVcWEQMVhJ31LwIDAQAB",