diff --git a/src/dawn/native/Buffer.cpp b/src/dawn/native/Buffer.cpp
index 87db6ac..fd13a3c 100644
--- a/src/dawn/native/Buffer.cpp
+++ b/src/dawn/native/Buffer.cpp
@@ -422,6 +422,9 @@
 }
 
 void BufferBase::Unmap() {
+    if (mState == BufferState::Destroyed) {
+        return;
+    }
     UnmapInternal(WGPUBufferMapAsyncStatus_UnmappedBeforeCallback);
 }
 
diff --git a/src/dawn/tests/unittests/validation/BufferValidationTests.cpp b/src/dawn/tests/unittests/validation/BufferValidationTests.cpp
index c943c4e..3b2f3ae 100644
--- a/src/dawn/tests/unittests/validation/BufferValidationTests.cpp
+++ b/src/dawn/tests/unittests/validation/BufferValidationTests.cpp
@@ -528,6 +528,22 @@
     }
 }
 
+// Test that unmap then mapping a destroyed buffer is an error.
+// Regression test for crbug.com/1388920.
+TEST_F(BufferValidationTest, MapDestroyedBufferAfterUnmap) {
+    wgpu::Buffer buffer = CreateMapReadBuffer(4);
+    buffer.Destroy();
+    buffer.Unmap();
+
+    ASSERT_DEVICE_ERROR(buffer.MapAsync(
+        wgpu::MapMode::Read, 0, wgpu::kWholeMapSize,
+        [](WGPUBufferMapAsyncStatus status, void* userdata) {
+            EXPECT_EQ(WGPUBufferMapAsyncStatus_Error, status);
+        },
+        nullptr));
+    WaitForAllOperations(device);
+}
+
 // Test that it is valid to submit a buffer in a queue with a map usage if it is unmapped
 TEST_F(BufferValidationTest, SubmitBufferWithMapUsage) {
     wgpu::BufferDescriptor descriptorA;