diff --git a/linedance-app/local/scanner.py b/linedance-app/local/scanner.py
index 8a570189..284f3db6 100644
--- a/linedance-app/local/scanner.py
+++ b/linedance-app/local/scanner.py
@@ -198,7 +198,11 @@ def scan_library(library_id: int, library_path: str, db_path: str,
 
             conn.commit()
         except Exception as e:
-            logger.warning(f"Scan fejl {fp.name}: {e}")
+            # UNIQUE constraint er forventet og ufarlig — sang findes allerede
+            if "UNIQUE constraint" in str(e):
+                logger.debug(f"Sang allerede i DB: {fp.name}")
+            else:
+                logger.warning(f"Scan fejl {fp.name}: {e}")
 
         done += 1
         # Lille pause efter hver scannet fil så GUI ikke hænger
@@ -248,4 +252,4 @@ if __name__ == "__main__":
     count = scan_library(lib_id, lib_path, db_path,
                          progress_callback=report)
     print(json.dumps({"done": count, "total": count, "finished": True}),
-          flush=True)
+          flush=True)
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