diff --git a/otherarch/sdcpp/sdtype_adapter.cpp b/otherarch/sdcpp/sdtype_adapter.cpp
index 8c66b49ea..6b7c4cca3 100644
--- a/otherarch/sdcpp/sdtype_adapter.cpp
+++ b/otherarch/sdcpp/sdtype_adapter.cpp
@@ -1771,11 +1771,11 @@ sd_generation_outputs sdtype_generate(const sd_generation_inputs inputs)
 
 static void step_callback(int step, int frame_count, sd_image_t* image, bool is_noisy, void* data)
 {
+    std::lock_guard<std::mutex> lock(geninfo.mux);
     double step_time = get_time_delta(geninfo.start_time);
 
     bool should_encode_preview = false;
     {
-        std::lock_guard<std::mutex> lock(geninfo.mux);
         if (geninfo.gendata.status <= 1) {
             geninfo.gendata.status = 2;
             if (geninfo.preview_requested && !geninfo.preview_enabled) {
@@ -1811,7 +1811,6 @@ static void step_callback(int step, int frame_count, sd_image_t* image, bool is_
     }
 
     {
-        std::lock_guard<std::mutex> lock(geninfo.mux);
         geninfo.gendata.step = step;
         geninfo.gendata.step_time = step_time;
         geninfo.gendata.preview = preview;