diff --git a/app/models/dmsf_file.rb b/app/models/dmsf_file.rb
index 01a7d530..59588fd7 100644
--- a/app/models/dmsf_file.rb
+++ b/app/models/dmsf_file.rb
@@ -96,9 +96,9 @@ class DmsfFile < ActiveRecord::Base
   end
 
   def self.storage_path
-    path = Setting.plugin_redmine_dmsf['dmsf_storage_directory'].strip
+    path = Setting.plugin_redmine_dmsf['dmsf_storage_directory'].try(:strip)
     if path.blank?
-      path = Pathname.new('files').join('dmsf')
+      path = Pathname.new('files').join('dmsf').to_s
     else
       pn = Pathname.new(path)
       return pn if pn.absolute?
diff --git a/app/models/dmsf_file_revision.rb b/app/models/dmsf_file_revision.rb
index 5b5b8845..869d89ec 100644
--- a/app/models/dmsf_file_revision.rb
+++ b/app/models/dmsf_file_revision.rb
@@ -160,7 +160,7 @@ class DmsfFileRevision < ActiveRecord::Base
     path = self.storage_base_path
     begin
       FileUtils.mkdir_p(path) unless File.exist?(path)
-    rescue Exception => e
+    rescue StandardError => e
       Rails.logger.error e.message
     end
     filename = path.join(self.disk_filename)