Prevent caching if there is an error occurs

graphql_cache_no_errors.patch

diff --git a/src/GraphQL/Execution/QueryProcessor.php b/src/GraphQL/Execution/QueryProcessor.php
index 941b664..a2a7f27 100644
--- a/src/GraphQL/Execution/QueryProcessor.php
+++ b/src/GraphQL/Execution/QueryProcessor.php
@@ -100,9 +100,9 @@ class QueryProcessor {
       $metadata->addCacheableDependency($container->get('metadata'));
     }
 
-    // Prevent caching if this is a mutation query.
+    // Prevent caching if this is a mutation query or an error occurs.
     $request = $context->getRequest();
-    if (!empty($request) && $request->hasMutations()) {
+    if (!empty($request) && $request->hasMutations() || $context->hasErrors()) {
       $metadata->setCacheMaxAge(0);
     }