diff --git a/src/Tokenizer.php b/src/Tokenizer.php
index 82ace8c..2ac597d 100644
--- a/src/Tokenizer.php
+++ b/src/Tokenizer.php
@@ -825,9 +825,10 @@ private function createNextToken(string $string, Token|null $previous = null): T
                 $last = strpos($string, "\n");
                 $type = Token::TOKEN_TYPE_COMMENT;
             } else { // Comment until closing comment tag
-                $pos = strpos($string, '*/', 2);
-                assert($pos !== false);
-                $last = $pos + 2;
+                $pos  = strpos($string, '*/', 2);
+                $last = $pos !== false
+                    ? $pos + 2
+                    : false;
                 $type = Token::TOKEN_TYPE_BLOCK_COMMENT;
             }
 
diff --git a/tests/TokenizerTest.php b/tests/TokenizerTest.php
index 71c53a1..f8a767e 100644
--- a/tests/TokenizerTest.php
+++ b/tests/TokenizerTest.php
@@ -120,6 +120,13 @@ public static function tokenizeData(): Generator
             ],
             '\'foo...',
         ];
+
+        yield 'unclosed block comment' => [
+            [
+                new Token(Token::TOKEN_TYPE_BLOCK_COMMENT, '/* foo...'),
+            ],
+            '/* foo...',
+        ];
     }
 
     /** @return Generator<mixed[]> */