diff --git a/aider/commands.py b/aider/commands.py
index 3a7e2e407..3edf3c157 100644
--- a/aider/commands.py
+++ b/aider/commands.py
@@ -166,7 +166,7 @@ class Commands:
             matched_files = [
                 file
                 for file in self.coder.abs_fnames
-                if word in os.path.relpath(file, self.coder.root)
+                if word.lower() in os.path.relpath(file, self.coder.root).lower()
             ]
             if not matched_files:
                 self.console.print(f"[red]No files matched '{word}'")
diff --git a/aider/getinput.py b/aider/getinput.py
index 8e2e140de..ca453e6fa 100644
--- a/aider/getinput.py
+++ b/aider/getinput.py
@@ -70,8 +70,11 @@ def get_input(history_file, fnames, commands):
         if not common_prefix.endswith(os.path.sep):
             common_prefix += os.path.sep
         short_fnames = [fname.replace(common_prefix, "", 1) for fname in fnames]
-    else:
+    elif len(fnames):
         short_fnames = [os.path.basename(fnames[0])]
+    else:
+        short_fnames = []
+
     show = " ".join(short_fnames)
     if len(show) > 10:
         show += "\n"