diff --git a/libs/vkd3d/command.c b/libs/vkd3d/command.c
index 4723e796..d3feb785 100644
--- a/libs/vkd3d/command.c
+++ b/libs/vkd3d/command.c
@@ -1140,6 +1140,18 @@ HRESULT d3d12_fence_create(struct d3d12_device *device,
 }
 
 /* Command buffers */
+static void d3d12_command_list_mark_as_invalid(struct d3d12_command_list *list,
+        const char *message, ...)
+{
+    va_list args;
+
+    va_start(args, message);
+    WARN("Command list %p is invalid: \"%s\".\n", list, vkd3d_dbg_vsprintf(message, args));
+    va_end(args);
+
+    list->is_valid = false;
+}
+
 static HRESULT d3d12_command_list_begin_command_buffer(struct d3d12_command_list *list)
 {
     struct d3d12_device *device = list->device;
@@ -3731,19 +3743,23 @@ static void STDMETHODCALLTYPE d3d12_command_list_ResourceBarrier(ID3D12GraphicsC
 
                 if (!is_valid_resource_state(transition->StateBefore))
                 {
-                    WARN("Invalid StateBefore %#x (barrier %u).\n", transition->StateBefore, i);
-                    list->is_valid = false;
+                    d3d12_command_list_mark_as_invalid(list,
+                            "Invalid StateBefore %#x (barrier %u).", transition->StateBefore, i);
                     continue;
                 }
                 if (!is_valid_resource_state(transition->StateAfter))
                 {
-                    WARN("Invalid StateAfter %#x (barrier %u).\n", transition->StateAfter, i);
-                    list->is_valid = false;
+                    d3d12_command_list_mark_as_invalid(list,
+                            "Invalid StateAfter %#x (barrier %u).", transition->StateAfter, i);
+                    continue;
+                }
+
+                if (!(resource = unsafe_impl_from_ID3D12Resource(transition->pResource)))
+                {
+                    d3d12_command_list_mark_as_invalid(list, "A resource pointer is NULL.");
                     continue;
                 }
 
-                resource = unsafe_impl_from_ID3D12Resource(transition->pResource);
-                assert(resource);
                 sub_resource_idx = transition->Subresource;
 
                 if (!vk_barrier_parameters_from_d3d12_resource_state(transition->StateBefore,
diff --git a/libs/vkd3d/device.c b/libs/vkd3d/device.c
index 217c1c85..37bfc407 100644
--- a/libs/vkd3d/device.c
+++ b/libs/vkd3d/device.c
@@ -3201,7 +3201,7 @@ void d3d12_device_mark_as_removed(struct d3d12_device *device, HRESULT reason,
     va_list args;
 
     va_start(args, message);
-    WARN("Device %p is lost (reason %#x, message \"%s\").\n",
+    WARN("Device %p is lost (reason %#x, \"%s\").\n",
             device, reason, vkd3d_dbg_vsprintf(message, args));
     va_end(args);
 
diff --git a/tests/d3d12_invalid_usage.c b/tests/d3d12_invalid_usage.c
index ab5deb5b..feb45b45 100644
--- a/tests/d3d12_invalid_usage.c
+++ b/tests/d3d12_invalid_usage.c
@@ -32,7 +32,7 @@ static void recreate_command_list_(unsigned int line, ID3D12Device *device,
     ok_(line)(hr == S_OK, "Failed to create command list, hr %#x.\n", hr);
 }
 
-static void test_invalid_texture_resource_barriers(void)
+static void test_invalid_resource_barriers(void)
 {
     ID3D12Resource *texture, *readback_buffer, *upload_buffer;
     ID3D12CommandAllocator *command_allocator;
@@ -127,6 +127,14 @@ static void test_invalid_texture_resource_barriers(void)
     hr = ID3D12GraphicsCommandList_Close(command_list);
     todo ok(hr == E_INVALIDARG, "Got unexpected hr %#x.\n", hr);
 
+    recreate_command_list(device, command_allocator, &command_list);
+
+    /* NULL resource. */
+    transition_resource_state(command_list, NULL,
+            D3D12_RESOURCE_STATE_RENDER_TARGET, D3D12_RESOURCE_STATE_COPY_SOURCE);
+    hr = ID3D12GraphicsCommandList_Close(command_list);
+    ok(hr == E_INVALIDARG, "Got unexpected hr %#x.\n", hr);
+
     ID3D12CommandAllocator_Release(command_allocator);
     ID3D12CommandQueue_Release(queue);
     ID3D12GraphicsCommandList_Release(command_list);
@@ -284,6 +292,6 @@ START_TEST(d3d12_invalid_usage)
     enable_d3d12_debug_layer(argc, argv);
     init_adapter_info();
 
-    run_test(test_invalid_texture_resource_barriers);
+    run_test(test_invalid_resource_barriers);
     run_test(test_invalid_copy_texture_region);
 }