diff --git a/include/rendering/vk_texture.hpp b/include/rendering/vk_texture.hpp
index fb0e01f1..985f699d 100644
--- a/include/rendering/vk_texture.hpp
+++ b/include/rendering/vk_texture.hpp
@@ -60,7 +60,7 @@ public:
     uint32_t getHeight() const { return image_.extent.height; }
     VkFormat getFormat() const { return image_.format; }
     uint32_t getMipLevels() const { return mipLevels_; }
-    bool isValid() const { return image_.image != VK_NULL_HANDLE; }
+    bool isValid() const { return image_.image != VK_NULL_HANDLE && sampler_ != VK_NULL_HANDLE; }
 
     // Write descriptor info for binding
     VkDescriptorImageInfo descriptorInfo(VkImageLayout layout =
diff --git a/tools/asset_extract/extractor.cpp b/tools/asset_extract/extractor.cpp
index 81c32ba1..0612c6fa 100644
--- a/tools/asset_extract/extractor.cpp
+++ b/tools/asset_extract/extractor.cpp
@@ -866,7 +866,7 @@ bool Extractor::run(const Options& opts) {
     // Merge with existing manifest so partial extractions don't nuke prior entries
     fs::path manifestPath = fs::path(effectiveOutputDir) / "manifest.json";
     if (fs::exists(manifestPath)) {
-        auto existing = loadManifestEntries(manifestPath);
+        auto existing = loadManifestEntries(manifestPath.string());
         if (!existing.empty()) {
             // New entries override existing ones with same key
             for (auto& entry : manifestEntries) {
@@ -889,7 +889,7 @@ bool Extractor::run(const Options& opts) {
               });
 
     // basePath is "." since manifest sits inside the output directory
-    if (!ManifestWriter::write(manifestPath, ".", manifestEntries)) {
+    if (!ManifestWriter::write(manifestPath.string(), ".", manifestEntries)) {
         std::cerr << "Failed to write manifest: " << manifestPath << "\n";
         return false;
     }