diff --git a/src/objects/intl-objects.cc b/src/objects/intl-objects.cc
index 4623dc19c3..b0c82e49d6 100644
--- a/src/objects/intl-objects.cc
+++ b/src/objects/intl-objects.cc
@@ -230,7 +230,6 @@ icu::StringPiece ToICUStringPiece(Isolate* isolate, Handle<String> string,
   if (!flat.IsOneByte()) return icu::StringPiece();
 
   int32_t length = string->length();
-  DCHECK_LT(offset, length);
   const char* char_buffer =
       reinterpret_cast<const char*>(flat.ToOneByteVector().begin());
   if (!String::IsAscii(char_buffer, length)) {
@@ -1418,10 +1417,8 @@ int Intl::CompareStrings(Isolate* isolate, const icu::Collator& icu_collator,
     return UCollationResult::UCOL_EQUAL;
   }
 
-  // Early return for empty strings.
-  if (string1->length() == 0 || string2->length() == 0) {
-    return ToUCollationResult(string1->length() - string2->length());
-  }
+  // We cannot return early for 0-length strings because of Unicode
+  // ignorable characters. See also crbug.com/1347690.
 
   string1 = String::Flatten(isolate, string1);
   string2 = String::Flatten(isolate, string2);
diff --git a/test/intl/regress-1347690.js b/test/intl/regress-1347690.js
new file mode 100644
index 0000000000..11878a5a87
--- /dev/null
+++ b/test/intl/regress-1347690.js
@@ -0,0 +1,19 @@
+// Copyright 2022 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Comparison to empty string could return zero for certain Unicode character.
+
+// In all locales, some Unicode characters are ignorable.
+// Unicode in C0
+assertEquals(0, (new Intl.Collator('en')).compare("","\u0001"));
+// SOFT HYPHEN
+assertEquals(0, (new Intl.Collator('en')).compare("","\u00AD"));
+// ARABIC SIGN SAMVAT
+assertEquals(0, (new Intl.Collator('en')).compare("","\u0604"));
+
+assertEquals(0, (new Intl.Collator('en')).compare("","\u0001\u0002\u00AD\u0604"));
+
+// Default Thai collation ignores punctuation.
+assertEquals(0, (new Intl.Collator('th')).compare(""," "));
+assertEquals(0, (new Intl.Collator('th')).compare("","*"));