diff --git a/ivatar/views.py b/ivatar/views.py
index 997a824..45f6bf9 100644
--- a/ivatar/views.py
+++ b/ivatar/views.py
@@ -698,6 +698,8 @@ class StatsView(TemplateView, JsonResponse):
 
             if result and result[0] > 0:
                 photo_count, avg_size_bytes = result
+                # Convert to float in case SQLite returns string
+                avg_size_bytes = float(avg_size_bytes) if avg_size_bytes else 0
                 avg_size_kb = round(avg_size_bytes / 1024, 2) if avg_size_bytes else 0
                 avg_size_mb = (
                     round(avg_size_bytes / (1024 * 1024), 2) if avg_size_bytes else 0