diff --git a/renamebycsv/cli.py b/renamebycsv/cli.py
index 1dc49a2..602c691 100755
--- a/renamebycsv/cli.py
+++ b/renamebycsv/cli.py
@@ -8,15 +8,16 @@ from renamebycsv.renamer import find_all_candidates, rename_by_csv
 
 def run(args):
     candidates = find_all_candidates(args.input_dir, args.pattern, args.recursive)
-    rename_by_csv(
-        args.csv,
-        candidates,
-        args.current,
-        args.become,
-        args.dry,
-        args.extension,
-        args.keep_extension,
-    )
+    if len(candidates):
+        rename_by_csv(
+            args.csv,
+            candidates,
+            args.current,
+            args.become,
+            args.dry,
+            args.extension,
+            args.keep_extension,
+        )
 
 
 def main():
diff --git a/renamebycsv/renamer.py b/renamebycsv/renamer.py
index 542f288..3fc8548 100644
--- a/renamebycsv/renamer.py
+++ b/renamebycsv/renamer.py
@@ -32,6 +32,8 @@ def find_all_candidates(input_dir: str, regex: str, recursive: bool):
             regex,
             input_dir,
         )
+    else:
+        logging.info("Collected %d files to rename.", len(results))
     return results
 
 
@@ -51,6 +53,10 @@ def rename_by_csv(
         become_col_ind = None
         for row in reader:
             if current_col_ind is None and become_col_ind is None:
+                if current not in row:
+                    logging.error("\"%s\" not in header %s.", current, list(row))
+                if become not in row:
+                    logging.error("\"%s\" not in header %s.", become, list(row))
                 current_col_ind = row.index(current)
                 become_col_ind = row.index(become)
                 continue
@@ -80,7 +86,7 @@ def rename_by_csv(
         logging.info(f'Will rename "{original}" to "{os.path.basename(objective)}"')
         if os.path.exists(objective):
             logging.error(
-                f'Path at "{objective}" exists, not continuing. '
+                f'Path at "{objective}" already exists, not continuing. '
                 "Use -f to overwrite instead of stopping."
             )
             exit(1)
diff --git a/setup.cfg b/setup.cfg
index d8e3b50..7585359 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = renamebycsv
-version = 0.0.7
+version = 0.0.8
 
 [options]
 packages = renamebycsv