Additional experimental fix for r35261.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@35264 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 0 deletions

diff --git a/ext/json/generator/generator.h b/ext/json/generator/generator.h
index 3220178a8f..4958cf094d 100644
--- a/ext/json/generator/generator.h
+++ b/ext/json/generator/generator.h
@@ -105,6 +105,7 @@ typedef struct JSON_Generator_StateStruct {
     Data_Get_Struct(Vstate, JSON_Generator_State, state);                                       \
     buffer = cState_prepare_buffer(Vstate);                                                     \
     generate_json_##type(buffer, Vstate, state, self);                                          \
+    RB_GC_GUARD(Vstate); \
     return fbuffer_to_s(buffer)
 
 static VALUE mHash_to_json(int argc, VALUE *argv, VALUE self);