diff --git a/examples/custom_plugin/Cargo.toml b/examples/custom_plugin/Cargo.toml
index 106e48ebb..b9ee06ae7 100644
--- a/examples/custom_plugin/Cargo.toml
+++ b/examples/custom_plugin/Cargo.toml
@@ -10,9 +10,14 @@ name = "custom_plugin"
 path = "src/lib.rs"
 crate-type = ["cdylib"]
 
+
+[features]
+default = ["flutter"]
+flutter = []
+
 [dependencies]
 lazy_static = "1.4.0"
-rustdesk = { path = "../../", version = "1.2.0"}
+rustdesk = { path = "../../", version = "1.2.0", features = ["flutter"]}
 
 [profile.release]
 lto = true
diff --git a/examples/custom_plugin/src/lib.rs b/examples/custom_plugin/src/lib.rs
index be051c1d9..860e0366a 100644
--- a/examples/custom_plugin/src/lib.rs
+++ b/examples/custom_plugin/src/lib.rs
@@ -9,6 +9,8 @@ lazy_static::lazy_static! {
     pub static ref API: RustDeskApiTable = RustDeskApiTable::default();
 }
 
+
+
 #[no_mangle]
 fn plugin_name() -> *const c_char {
     return PLUGIN_NAME.as_ptr();
diff --git a/src/plugins.rs b/src/plugins.rs
index 3235bce4a..dfbdc7753 100644
--- a/src/plugins.rs
+++ b/src/plugins.rs
@@ -36,8 +36,8 @@ pub trait Plugin {
 #[repr(C)]
 #[derive(Default, Clone)]
 pub struct RustDeskPluginTable {
-    pub init: Option<PluginInitFunc>,
-    pub dispose: Option<PluginDisposeFunc>,
+    pub init: Option<PluginInitFunc>, // NonNull
+    pub dispose: Option<PluginDisposeFunc>, // NonNull
 }
 
 pub struct PluginImpl {