diff --git a/src/Xpath/Expression/SequenceExpression.php b/src/Xpath/Expression/SequenceExpression.php
index 788a541..b2c9e3e 100644
--- a/src/Xpath/Expression/SequenceExpression.php
+++ b/src/Xpath/Expression/SequenceExpression.php
@@ -51,7 +51,9 @@ public function supports(Lexer $lexer): bool
         $key = $lexer->key() + 1;
         $commaFound = false;
 
-        while ($nextToken = $lexer->peek($key)) {
+        while ($lexer->peek($key) !== '') {
+            $nextToken = $lexer->peek($key);
+
             if ($nextToken === '(') {
                 return false;
             }
diff --git a/test/Stubs/Xpath/Sequence/constructor-integer.xsl b/test/Stubs/Xpath/Sequence/constructor-integer.xsl
index 0c0936f..098691d 100644
--- a/test/Stubs/Xpath/Sequence/constructor-integer.xsl
+++ b/test/Stubs/Xpath/Sequence/constructor-integer.xsl
@@ -4,7 +4,7 @@
 
     <xsl:template match="collection">
 
-        <xsl:value-of select="(1, 2, 3)" />
+        <xsl:value-of select="(0, 1, 2, 3)" />
 
     </xsl:template>