check if email is null

events/api/src/main/java/org/keycloak/events/Errors.java

@@ -41,4 +41,5 @@ public interface Errors {
     String USER_SESSION_NOT_FOUND = "user_session_not_found";
 
     String EMAIL_SEND_FAILED = "email_send_failed";
+    String INVALID_EMAIL = "invalid_email";
 }

services/src/main/java/org/keycloak/services/resources/LoginActionsService.java

@@ -826,7 +826,10 @@ public class LoginActionsService {
             event.error(Errors.USER_NOT_FOUND);
         } else if(!user.isEnabled()) {
             event.user(user).error(Errors.USER_DISABLED);
-        } else {
+        }
+        else if(user.getEmail() == null || user.getEmail().trim().length() == 0) {
+            event.user(user).error(Errors.INVALID_EMAIL);
+        } else{
             event.user(user);
 
             UserSessionModel userSession = session.sessions().createUserSession(realm, user, username, clientConnection.getRemoteAddr(), "form", false);

testsuite/integration/src/test/java/org/keycloak/testsuite/forms/ResetPasswordTest.java

@@ -271,6 +271,44 @@ public class ResetPasswordTest {
             }
         });
 
+        try {
+            loginPage.open();
+            loginPage.resetPassword();
+
+            resetPasswordPage.assertCurrent();
+
+            resetPasswordPage.changePassword("login-test");
+
+            resetPasswordPage.assertCurrent();
+
+            Assert.assertEquals("You should receive an email shortly with further instructions.", resetPasswordPage.getSuccessMessage());
+
+            Thread.sleep(1000);
+
+            Assert.assertEquals(0, greenMail.getReceivedMessages().length);
+
+            events.expectRequiredAction(EventType.SEND_RESET_PASSWORD_ERROR).session((String) null).user(userId).detail(Details.USERNAME, "login-test").removeDetail(Details.CODE_ID).error("invalid_email").assertEvent();
+        } finally {
+            keycloakRule.configure(new KeycloakRule.KeycloakSetup() {
+                @Override
+                public void config(RealmManager manager, RealmModel adminstrationRealm, RealmModel appRealm) {
+                    session.users().getUserByUsername("login-test", appRealm).setEmail(email[0]);
+                }
+            });
+        }
+    }
+
+    @Test
+    public void resetPasswordWrongSmtp() throws IOException, MessagingException, InterruptedException {
+        final String[] host = new String[1];
+        keycloakRule.configure(new KeycloakRule.KeycloakSetup() {
+            @Override
+            public void config(RealmManager manager, RealmModel adminstrationRealm, RealmModel appRealm) {
+                host[0] =  appRealm.getSmtpConfig().get("host");
+                appRealm.getSmtpConfig().put("host", "invalid_host");
+            }
+        });
+
         try {
             loginPage.open();
             loginPage.resetPassword();
@@ -292,7 +330,7 @@ public class ResetPasswordTest {
             keycloakRule.configure(new KeycloakRule.KeycloakSetup() {
                 @Override
                 public void config(RealmManager manager, RealmModel adminstrationRealm, RealmModel appRealm) {
-                    session.users().getUserByUsername("login-test", appRealm).setEmail(email[0]);
+                    appRealm.getSmtpConfig().put("host",host[0]);
                 }
             });
         }