From 3d92cd70551f840878cdcc62d5152f1f5d220fda Mon Sep 17 00:00:00 2001
From: Robert Mosolgo <rdmosolgo@gmail.com>
Date: Wed, 13 May 2026 15:03:23 -0400
Subject: [PATCH 1/2] Backtrace: fix loop when error preparing arguments

---
 lib/graphql/backtrace/table.rb                | 11 +++++-
 .../execution/interpreter/arguments_cache.rb  |  3 ++
 spec/graphql/backtrace_spec.rb                | 39 +++++++++++++++++++
 3 files changed, 52 insertions(+), 1 deletion(-)

diff --git a/lib/graphql/backtrace/table.rb b/lib/graphql/backtrace/table.rb
index db279c39e32..04a60769d59 100644
--- a/lib/graphql/backtrace/table.rb
+++ b/lib/graphql/backtrace/table.rb
@@ -90,7 +90,16 @@ def rows
 
           if ast_node
             field_defn = query.get_field(result.graphql_result_type, ast_node.name)
-            args = query.arguments_for(ast_node, field_defn).to_h
+            args = begin
+              if (cached_args = query.arguments_cache.cached_arguments_for(ast_node, field_defn))
+                cached_args.to_h
+              else
+                EmptyObjects::EMPTY_HASH
+              end
+            rescue StandardError => err
+              "Failed to load arguments, #{err.class}: #{err.message}"
+            end
+
             field_path = field_defn.path
             if ast_node.alias
               field_path += " as #{ast_node.alias}"
diff --git a/lib/graphql/execution/interpreter/arguments_cache.rb b/lib/graphql/execution/interpreter/arguments_cache.rb
index 92cd9ab7141..ec5482d865a 100644
--- a/lib/graphql/execution/interpreter/arguments_cache.rb
+++ b/lib/graphql/execution/interpreter/arguments_cache.rb
@@ -30,7 +30,10 @@ def fetch(ast_node, argument_owner, parent_object)
               @storage[argument_owner][parent_object][ast_node] = resolved_args
             end
           end
+        end
 
+        def cached_arguments_for(ast_node, argument_owner)
+          @storage[argument_owner][nil][ast_node]
         end
 
         # @yield [Interpreter::Arguments, Lazy<Interpreter::Arguments>] The finally-loaded arguments
diff --git a/spec/graphql/backtrace_spec.rb b/spec/graphql/backtrace_spec.rb
index 25498efc2dd..c54bf7f1346 100644
--- a/spec/graphql/backtrace_spec.rb
+++ b/spec/graphql/backtrace_spec.rb
@@ -375,4 +375,43 @@ def greeting(name:)
       assert_equal ["name is too short (minimum is 5)"], ValidatorBacktraceSchema.execute("{ greeting(name: \"Tim\") }")["errors"].map { |e| e["message"] }
     end
   end
+
+
+  describe "when prepare fails as in https://github.com/rmosolgo/graphql-ruby/issues/5627" do
+    class BacktracePrepareErrorSchema < GraphQL::Schema
+      class CreateComment < GraphQL::Schema::RelayClassicMutation
+        argument :author_id, String, as: :author, prepare: :prepare_author
+        argument :body,      String
+
+        field :comment_id, String
+
+        def self.prepare_author(id, _ctx)
+          raise "Author #{id} not found"
+        end
+
+        def resolve(author:, body:)
+          { comment_id: "new-comment" }
+        end
+      end
+
+      class Mutation < GraphQL::Schema::Object
+        field :create_comment, mutation: CreateComment
+      end
+
+      use GraphQL::Backtrace
+      mutation Mutation
+    end
+
+    it "works" do
+      assert_raises GraphQL::Backtrace::TracedError do
+        BacktracePrepareErrorSchema.execute <<~GRAPHQL
+          mutation {
+            createComment(input: { authorId: "unknown", body: "hello" }) {
+              commentId
+            }
+          }
+        GRAPHQL
+      end
+    end
+  end
 end

From 357251cd83ce9152fc95f0404a72511c1e128d89 Mon Sep 17 00:00:00 2001
From: Robert Mosolgo <rdmosolgo@gmail.com>
Date: Wed, 13 May 2026 15:04:11 -0400
Subject: [PATCH 2/2] Skip on exec-next

---
 spec/graphql/backtrace_spec.rb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/spec/graphql/backtrace_spec.rb b/spec/graphql/backtrace_spec.rb
index c54bf7f1346..c5a8f502c44 100644
--- a/spec/graphql/backtrace_spec.rb
+++ b/spec/graphql/backtrace_spec.rb
@@ -403,6 +403,7 @@ class Mutation < GraphQL::Schema::Object
     end
 
     it "works" do
+      skip_with_exec_next
       assert_raises GraphQL::Backtrace::TracedError do
         BacktracePrepareErrorSchema.execute <<~GRAPHQL
           mutation {