diff --git a/src/Grant/ImplicitGrant.php b/src/Grant/ImplicitGrant.php
index 976acefb..634a79cd 100644
--- a/src/Grant/ImplicitGrant.php
+++ b/src/Grant/ImplicitGrant.php
@@ -142,6 +142,11 @@ class ImplicitGrant extends AbstractAuthorizeGrant
                 $this->getEmitter()->emit(new RequestEvent(RequestEvent::CLIENT_AUTHENTICATION_FAILED, $request));
                 throw OAuthServerException::invalidClient();
             }
+        } elseif (is_array($client->getRedirectUri()) && count($client->getRedirectUri()) !== 1
+            || empty($client->getRedirectUri())
+        ) {
+            $this->getEmitter()->emit(new RequestEvent(RequestEvent::CLIENT_AUTHENTICATION_FAILED, $request));
+            throw OAuthServerException::invalidClient();
         }
 
         $scopes = $this->validateScopes(