diff --git a/app/controllers/api_controller.rb b/app/controllers/api_controller.rb
index b9d09fe..f8d2f55 100644
--- a/app/controllers/api_controller.rb
+++ b/app/controllers/api_controller.rb
@@ -11,7 +11,7 @@ class ApiController < ApplicationController
     unless File.file?(file) && File.readable?(file)
       return render json: [], status: 403
     end
-    render json: file_tail(file) || []
+    render json: file_tail(file)
   end
 
   def empty_json
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 1091d98..cda9ba7 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -101,10 +101,10 @@ class ApplicationController < ActionController::Base
   end
 
   def file_tail(path, limit = 10)
-    return unless path
-    return unless File.exists? path
+    return [] unless path
+    return [] unless File.exists? path
     reader = FileReverseReader.new(File.open(path))
-    return if reader.binary_file?
+    return [] if reader.binary_file?
     reader.tail(limit)
   end
 end