fix: resolve several issues in message router

cef/CHANGELOG.md

@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+
+- port missing early returns in BrowserSideRouter and BrowserInfoMap to prevent panics during startup
+- return string responses as V8 strings instead of ArrayBuffer from RendererSideRouter
+
 ## [144.0.1+144.0.6](https://github.com/tauri-apps/cef-rs/compare/cef-v144.0.0+144.0.6...cef-v144.0.1+144.0.6) - 2026-01-22
 
 ### Other

cef/src/wrapper/browser_info_map.rs

@@ -107,10 +107,13 @@ impl<K: Copy + Ord, V: Clone> BrowserInfoMap<K, V> {
     /// Find all objects associated with the specified browser. If any objects are
     /// removed using the Visitor the caller is responsible for destroying them.
     pub fn find_browser_all(&mut self, browser_id: i32, visitor: &dyn BrowserInfoMapVisitor<K, V>) {
-        let info_map = self
-            .map
-            .get_mut(&browser_id)
-            .expect("missing browser info map");
+        if self.map.is_empty() {
+            return;
+        }
+
+        let Some(info_map) = self.map.get_mut(&browser_id) else {
+            return;
+        };
 
         let mut removed = vec![];
         let keys: Vec<_> = info_map.keys().copied().collect();

cef/src/wrapper/message_router.rs

@@ -666,6 +666,10 @@ impl BrowserSideRouter {
             return;
         };
 
+        if browser_query_info_map.is_empty() {
+            return;
+        }
+
         struct Visitor {
             router: Arc<BrowserSideRouter>,
             handler_id: Option<HandlerId>,
@@ -1322,28 +1326,35 @@ impl RendererSideRouter {
         let Some(mut context) = self.get_context_by_id(context_id) else {
             return;
         };
-        if context.enter() == 0 {
-            return;
-        }
 
-        let data = match &response {
-            mru::MessagePayload::Empty => &[],
-            mru::MessagePayload::String(s) => s.as_slice().unwrap_or(&[]),
-            mru::MessagePayload::Binary(b) => b.data(),
-        };
+        let value = match &response {
+            mru::MessagePayload::String(s) => v8_value_create_string(Some(&s.into())),
+            mru::MessagePayload::Empty | mru::MessagePayload::Binary(_) => {
+                let data = match &response {
+                    mru::MessagePayload::Binary(b) => b.data(),
+                    _ => &[],
+                };
 
-        #[cfg(feature = "sandbox")]
-        let value = v8_value_create_array_buffer_with_copy(data.as_ptr() as *mut u8, data.len());
-        #[cfg(not(feature = "sandbox"))]
-        let value = v8_value_create_array_buffer(
-            data.as_ptr() as *mut u8,
-            data.len(),
-            Some(&mut mru::BinaryValueArrayBufferReleaseCallback::new(
-                response,
-            )),
-        );
+                if context.enter() == 0 {
+                    return;
+                }
 
-        context.exit();
+                #[cfg(feature = "sandbox")]
+                let value =
+                    v8_value_create_array_buffer_with_copy(data.as_ptr() as *mut u8, data.len());
+                #[cfg(not(feature = "sandbox"))]
+                let value = v8_value_create_array_buffer(
+                    data.as_ptr() as *mut u8,
+                    data.len(),
+                    Some(&mut mru::BinaryValueArrayBufferReleaseCallback::new(
+                        response,
+                    )),
+                );
+
+                context.exit();
+                value
+            }
+        };
 
         success_callback.execute_function_with_context(Some(&mut context), None, Some(&[value]));
     }