diff --git a/docs/changelogs/v4.7.7.md b/docs/changelogs/v4.7.7.md
index 4472c7de75ef..dc3483c1c292 100644
--- a/docs/changelogs/v4.7.7.md
+++ b/docs/changelogs/v4.7.7.md
@@ -16,6 +16,7 @@ Release Date: Unreleased
 
 ## Bugs Fixed
 
+- **Helpers:** Fixed a bug in `ArrayHelper::dotKeyExists()` where `'0'` path segments caused early loop termination and returned `true`, and non-array intermediate values threw a `TypeError`.
 - **HTTP:** Fixed a bug where `UploadedFile::move()` and `UploadedFile::store()` on Windows could store a file under a different name than `getName()` reported, or write its contents to an NTFS alternate data stream. Filenames ending in a period or space or containing a colon are now rejected, including explicitly supplied names.
 - **Security:** Fixed a bug where `Security::__construct()` threw a `TypeError` when the CSRF cookie was an array, causing an HTTP 500 response for affected requests.
 - **Worker Mode:** Fixed a bug where every request that ended with an uncaught exception, including a `404 Page Not Found` without a 404 override, called `exit()` in the exception handler. This ended the worker script, so FrankenPHP booted a new one, and the worker loop skipped its cleanup after the request. The exception handler now returns to the worker loop.
diff --git a/system/Helpers/Array/ArrayHelper.php b/system/Helpers/Array/ArrayHelper.php
index b48efbfc4802..d3a34d4448dd 100644
--- a/system/Helpers/Array/ArrayHelper.php
+++ b/system/Helpers/Array/ArrayHelper.php
@@ -146,12 +146,16 @@ public static function dotKeyExists(string $index, array $array): bool
         $currentArray = $array;
 
         // Grab the current index
-        while ($currentIndex = array_shift($indexes)) {
+        while (($currentIndex = array_shift($indexes)) !== null) {
             if ($currentIndex === '*') {
                 $currentIndex = array_shift($indexes);
 
+                if (! is_array($currentArray)) {
+                    return false;
+                }
+
                 foreach ($currentArray as $item) {
-                    if (! array_key_exists($currentIndex, $item)) {
+                    if (! is_array($item) || ! array_key_exists($currentIndex, $item)) {
                         return false;
                     }
                 }
@@ -166,7 +170,7 @@ public static function dotKeyExists(string $index, array $array): bool
                 continue;
             }
 
-            if (! array_key_exists($currentIndex, $currentArray)) {
+            if (! is_array($currentArray) || ! array_key_exists($currentIndex, $currentArray)) {
                 return false;
             }
 
diff --git a/tests/system/Helpers/Array/ArrayHelperDotKeyExistsTest.php b/tests/system/Helpers/Array/ArrayHelperDotKeyExistsTest.php
index 432fafcf1a0c..218683fe8a8c 100644
--- a/tests/system/Helpers/Array/ArrayHelperDotKeyExistsTest.php
+++ b/tests/system/Helpers/Array/ArrayHelperDotKeyExistsTest.php
@@ -43,7 +43,13 @@ public function testDotKeyExists(): void
         $this->assertTrue(ArrayHelper::dotKeyExists('contacts.friends', $this->array));
         $this->assertFalse(ArrayHelper::dotKeyExists('not.friends', $this->array));
         $this->assertTrue(ArrayHelper::dotKeyExists('contacts.friends.0.name', $this->array));
+        $this->assertFalse(ArrayHelper::dotKeyExists('contacts.friends.0.nonexistent', $this->array));
         $this->assertFalse(ArrayHelper::dotKeyExists('contacts.friends.1.name', $this->array));
+        $this->assertFalse(ArrayHelper::dotKeyExists('0', []));
+        $this->assertTrue(ArrayHelper::dotKeyExists('0', ['0' => 'value']));
+        $this->assertTrue(ArrayHelper::dotKeyExists('0', ['0' => null]));
+        $this->assertFalse(ArrayHelper::dotKeyExists('contacts.friends.0.name.sub', $this->array));
+        $this->assertFalse(ArrayHelper::dotKeyExists('contacts.friends.1.age.sub', $this->array));
     }
 
     public function testDotKeyExistsWithEndingWildCard(): void
@@ -72,6 +78,10 @@ public function testDotKeyExistsWithWildCard(): void
         $this->assertTrue(ArrayHelper::dotKeyExists('contacts.*.0.age', $this->array));
         $this->assertTrue(ArrayHelper::dotKeyExists('contacts.*.1.age', $this->array));
         $this->assertTrue(ArrayHelper::dotKeyExists('contacts.*.0.name', $this->array));
+        $this->assertFalse(ArrayHelper::dotKeyExists('contacts.*.0.nonexistent', $this->array));
         $this->assertFalse(ArrayHelper::dotKeyExists('contacts.*.1.name', $this->array));
+        $this->assertFalse(ArrayHelper::dotKeyExists('contacts.friends.*.age.sub', $this->array));
+        $this->assertFalse(ArrayHelper::dotKeyExists('contacts.friends.1.age.*.sub', $this->array));
+        $this->assertFalse(ArrayHelper::dotKeyExists('*.name', [['name' => 'Fred'], 'not-an-array']));
     }
 }