diff --git a/src/command_ui.cc b/src/command_ui.cc
index 2f44adc7..eff77382 100644
--- a/src/command_ui.cc
+++ b/src/command_ui.cc
@@ -175,7 +175,7 @@ as_boolean(const torrent::Object& rawArgs) {
 
 torrent::Object
 apply_not(rpc::target_type target, const torrent::Object& rawArgs) {
-  return (int64_t)as_boolean(rawArgs);
+  return (int64_t)!as_boolean(rawArgs);
 }
 
 torrent::Object
diff --git a/src/core/view.cc b/src/core/view.cc
index ab6814d5..0f4ca030 100644
--- a/src/core/view.cc
+++ b/src/core/view.cc
@@ -132,6 +132,9 @@ struct view_downloads_filter : std::unary_function<Download*, bool> {
   view_downloads_filter(const std::string& cmd) : m_command(cmd) {}
 
   bool operator () (Download* d1) const {
+    if (m_command.empty())
+      return true;
+
     try {
       torrent::Object result = rpc::parse_command_single(rpc::make_target(d1), m_command);