diff --git a/jf-assembler/include/AssemblerStats.hpp b/jf-assembler/include/AssemblerStats.hpp
index a8267a6..170521a 100644
--- a/jf-assembler/include/AssemblerStats.hpp
+++ b/jf-assembler/include/AssemblerStats.hpp
@@ -21,7 +21,7 @@ public:
     AssemblerStats(const std::string &detector_name,
                    const size_t stats_modulo);
 
-    void record_stats(const ImageMetadata &meta, const uint32_t n_lost_pulses);
+    void record_stats(const ImageMetadata *meta, const uint32_t n_lost_pulses);
 };
 
 
diff --git a/jf-assembler/src/AssemblerStats.cpp b/jf-assembler/src/AssemblerStats.cpp
index e295da6..ce038c9 100644
--- a/jf-assembler/src/AssemblerStats.cpp
+++ b/jf-assembler/src/AssemblerStats.cpp
@@ -23,12 +23,12 @@ void AssemblerStats::reset_counters()
 }
 
 void AssemblerStats::record_stats(
-        const ImageMetadata &meta, const uint32_t n_lost_pulses)
+        const ImageMetadata *meta, const uint32_t n_lost_pulses)
 {
     image_counter_++;
     n_sync_lost_images_ += n_lost_pulses;
 
-    if (!meta.is_good_image) {
+    if (!meta->is_good_image) {
         n_corrupted_images_++;
     }