diff --git a/src/crypto/crypto_timing.cc b/src/crypto/crypto_timing.cc
index a0194f22cfd51e..0601f70926b245 100644
--- a/src/crypto/crypto_timing.cc
+++ b/src/crypto/crypto_timing.cc
@@ -56,6 +56,20 @@ bool FastTimingSafeEqual(Local<Value> receiver,
                          // NOLINTNEXTLINE(runtime/references)
                          FastApiCallbackOptions& options) {
   HandleScope scope(options.isolate);
+  if (!IsAnyBufferSource(a_obj)) {
+    TRACK_V8_FAST_API_CALL("crypto.timingSafeEqual.error");
+    THROW_ERR_INVALID_ARG_TYPE(options.isolate,
+                               "The \"buf1\" argument must be an instance of "
+                               "ArrayBuffer, Buffer, TypedArray, or DataView.");
+    return false;
+  }
+  if (!IsAnyBufferSource(b_obj)) {
+    TRACK_V8_FAST_API_CALL("crypto.timingSafeEqual.error");
+    THROW_ERR_INVALID_ARG_TYPE(options.isolate,
+                               "The \"buf2\" argument must be an instance of "
+                               "ArrayBuffer, Buffer, TypedArray, or DataView.");
+    return false;
+  }
   ArrayBufferViewContents<uint8_t> a(a_obj);
   ArrayBufferViewContents<uint8_t> b(b_obj);
   if (a.length() != b.length()) {
diff --git a/test/sequential/test-crypto-timing-safe-equal-fast.js b/test/sequential/test-crypto-timing-safe-equal-fast.js
new file mode 100644
index 00000000000000..0774eeae561fbb
--- /dev/null
+++ b/test/sequential/test-crypto-timing-safe-equal-fast.js
@@ -0,0 +1,40 @@
+// Test v8 fast path for crypto.timingSafeEqual works correctly.
+// Flags: --expose-internals --allow-natives-syntax
+'use strict';
+
+const common = require('../common');
+
+if (!common.hasCrypto)
+  common.skip('missing crypto');
+
+const assert = require('assert');
+const crypto = require('crypto');
+
+// V8 Fast API
+const foo = Buffer.from('foo');
+const bar = Buffer.from('bar');
+const longer = Buffer.from('longer');
+function testFastPath(buf1, buf2) {
+  return crypto.timingSafeEqual(buf1, buf2);
+}
+eval('%PrepareFunctionForOptimization(testFastPath)');
+assert.strictEqual(testFastPath(foo, bar), false);
+eval('%OptimizeFunctionOnNextCall(testFastPath)');
+assert.strictEqual(testFastPath(foo, bar), false);
+assert.strictEqual(testFastPath(foo, foo), true);
+assert.throws(() => testFastPath(foo, longer), {
+  code: 'ERR_CRYPTO_TIMING_SAFE_EQUAL_LENGTH',
+});
+assert.throws(() => testFastPath(foo, ''), {
+  code: 'ERR_INVALID_ARG_TYPE',
+});
+assert.throws(() => testFastPath('', ''), {
+  code: 'ERR_INVALID_ARG_TYPE',
+});
+
+if (common.isDebug) {
+  const { internalBinding } = require('internal/test/binding');
+  const { getV8FastApiCallCount } = internalBinding('debug');
+  assert.strictEqual(getV8FastApiCallCount('crypto.timingSafeEqual.ok'), 2);
+  assert.strictEqual(getV8FastApiCallCount('crypto.timingSafeEqual.error'), 3);
+}
diff --git a/test/sequential/test-crypto-timing-safe-equal.js b/test/sequential/test-crypto-timing-safe-equal.js
index 80b3a69e59cb2d..74ae39fbafcd0c 100644
--- a/test/sequential/test-crypto-timing-safe-equal.js
+++ b/test/sequential/test-crypto-timing-safe-equal.js
@@ -1,4 +1,4 @@
-// Flags: --expose-internals --no-warnings --allow-natives-syntax
+// Flags: --no-warnings
 'use strict';
 const common = require('../common');
 if (!common.hasCrypto)
@@ -92,28 +92,3 @@ assert.throws(
     name: 'TypeError',
   }
 );
-
-{
-  // V8 Fast API
-  const foo = Buffer.from('foo');
-  const bar = Buffer.from('bar');
-  const longer = Buffer.from('longer');
-  function testFastPath(buf1, buf2) {
-    return crypto.timingSafeEqual(buf1, buf2);
-  }
-  eval('%PrepareFunctionForOptimization(testFastPath)');
-  assert.strictEqual(testFastPath(foo, bar), false);
-  eval('%OptimizeFunctionOnNextCall(testFastPath)');
-  assert.strictEqual(testFastPath(foo, bar), false);
-  assert.strictEqual(testFastPath(foo, foo), true);
-  assert.throws(() => testFastPath(foo, longer), {
-    code: 'ERR_CRYPTO_TIMING_SAFE_EQUAL_LENGTH',
-  });
-
-  if (common.isDebug) {
-    const { internalBinding } = require('internal/test/binding');
-    const { getV8FastApiCallCount } = internalBinding('debug');
-    assert.strictEqual(getV8FastApiCallCount('crypto.timingSafeEqual.ok'), 2);
-    assert.strictEqual(getV8FastApiCallCount('crypto.timingSafeEqual.error'), 1);
-  }
-}