diff --git a/pyproject.toml b/pyproject.toml
index 97408951..b5ecf9c7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,7 +11,7 @@ build-backend = "scikit_build_core.build"
 
 [project]
 name = "craftground"
-version = "2.5.34"
+version = "2.5.35"
 description = "Lightweight Minecraft Environment for Reinforcement Learning"
 readme = "README.md"
 license = { file = "LICENSE" }
diff --git a/src/craftground/MinecraftEnv/src/main/cpp/framebuffer_capturer.cpp b/src/craftground/MinecraftEnv/src/main/cpp/framebuffer_capturer.cpp
index d514bb23..6bf68f91 100644
--- a/src/craftground/MinecraftEnv/src/main/cpp/framebuffer_capturer.cpp
+++ b/src/craftground/MinecraftEnv/src/main/cpp/framebuffer_capturer.cpp
@@ -419,7 +419,7 @@ Java_com_kyhsgeekcode_minecraftenv_FramebufferCapturer_initializeZerocopyImpl(
     return byteStringObject;
 }
 
-extern "C" JNIEXPORT void JNICALL
+extern "C" JNIEXPORT jobject JNICALL
 Java_com_kyhsgeekcode_minecraftenv_FramebufferCapturer_captureFramebufferZerocopyImpl(
     JNIEnv *env,
     jclass clazz,
@@ -452,6 +452,7 @@ Java_com_kyhsgeekcode_minecraftenv_FramebufferCapturer_captureFramebufferZerocop
     // but the original texture is TEXTURE_2D, so we need to convert to
     // TEXTURE_2D_RECTANGLE_ARB
     copyFramebufferToIOSurface(targetSizeX, targetSizeY);
+    return nullptr;
 }
 
 #elif defined(HAS_CUDA)
@@ -522,7 +523,7 @@ Java_com_kyhsgeekcode_minecraftenv_FramebufferCapturer_initializeZerocopyImpl(
     return byteStringObject;
 }
 
-extern "C" JNIEXPORT void JNICALL
+extern "C" JNIEXPORT jobject JNICALL
 Java_com_kyhsgeekcode_minecraftenv_FramebufferCapturer_captureFramebufferZerocopyImpl(
     JNIEnv *env,
     jclass clazz,
@@ -554,6 +555,7 @@ Java_com_kyhsgeekcode_minecraftenv_FramebufferCapturer_captureFramebufferZerocop
     // CUDA IPC handles are used to share the framebuffer with the Python side
     // However copy is required anyway
     copyFramebufferToCudaSharedMemory(targetSizeX, targetSizeY);
+    return nullptr;
 }
 
 #else
@@ -587,7 +589,7 @@ Java_com_kyhsgeekcode_minecraftenv_FramebufferCapturer_initializeZerocopyImpl(
 
 // TODO: Implement this function for normal mmap IPC based one copy. (GPU ->
 // CPU)
-extern "C" JNIEXPORT void JNICALL
+extern "C" JNIEXPORT jobject JNICALL
 Java_com_kyhsgeekcode_minecraftenv_FramebufferCapturer_captureFramebufferZerocopyImpl(
     JNIEnv *env,
     jclass clazz,
@@ -598,7 +600,7 @@ Java_com_kyhsgeekcode_minecraftenv_FramebufferCapturer_captureFramebufferZerocop
     jint mouseX,
     jint mouseY
 ) {
-    Java_com_kyhsgeekcode_minecraftenv_FramebufferCapturer_captureFramebuffer(
+    return Java_com_kyhsgeekcode_minecraftenv_FramebufferCapturer_captureFramebufferImpl(
         env,
         clazz,
         0,