diff --git a/MoltenVK/MoltenVK/GPUObjects/MVKBuffer.mm b/MoltenVK/MoltenVK/GPUObjects/MVKBuffer.mm
index 41ee4cef1..e14ff7d53 100644
--- a/MoltenVK/MoltenVK/GPUObjects/MVKBuffer.mm
+++ b/MoltenVK/MoltenVK/GPUObjects/MVKBuffer.mm
@@ -232,6 +232,7 @@
 }
 
 void MVKBuffer::initExternalMemory(VkExternalMemoryHandleTypeFlags handleTypes) {
+	if ( !handleTypes ) { return; }
 	if (mvkIsOnlyAnyFlagEnabled(handleTypes, VK_EXTERNAL_MEMORY_HANDLE_TYPE_MTLBUFFER_BIT_KHR)) {
 		_externalMemoryHandleTypes = handleTypes;
 		auto& xmProps = getPhysicalDevice()->getExternalBufferProperties(VK_EXTERNAL_MEMORY_HANDLE_TYPE_MTLBUFFER_BIT_KHR);
diff --git a/MoltenVK/MoltenVK/GPUObjects/MVKImage.mm b/MoltenVK/MoltenVK/GPUObjects/MVKImage.mm
index c605f45a9..323918f20 100644
--- a/MoltenVK/MoltenVK/GPUObjects/MVKImage.mm
+++ b/MoltenVK/MoltenVK/GPUObjects/MVKImage.mm
@@ -1142,6 +1142,7 @@
 }
 
 void MVKImage::initExternalMemory(VkExternalMemoryHandleTypeFlags handleTypes) {
+	if ( !handleTypes ) { return; }
 	if (mvkIsOnlyAnyFlagEnabled(handleTypes, VK_EXTERNAL_MEMORY_HANDLE_TYPE_MTLTEXTURE_BIT_KHR)) {
         auto& xmProps = getPhysicalDevice()->getExternalImageProperties(VK_EXTERNAL_MEMORY_HANDLE_TYPE_MTLTEXTURE_BIT_KHR);
         for(auto& memoryBinding : _memoryBindings) {