diff --git a/framework/db/ActiveRecord.php b/framework/db/ActiveRecord.php
index bf1f622..500029d 100644
--- a/framework/db/ActiveRecord.php
+++ b/framework/db/ActiveRecord.php
@@ -28,7 +28,7 @@ use yii\helpers\StringHelper;
  * @property TableSchema $tableSchema the schema information of the DB table associated with this AR class.
  * @property array $oldAttributes the old attribute values (name-value pairs).
  * @property array $dirtyAttributes the changed attribute values (name-value pairs).
- * @property boolean $isPrimaryKey whether the record is new and should be inserted when calling [[save()]].
+ * @property boolean $isNewRecord whether the record is new and should be inserted when calling [[save()]].
  * @property mixed $primaryKey the primary key value.
  * @property mixed $oldPrimaryKey the old primary key value.
  *
diff --git a/framework/db/ActiveRelation.php b/framework/db/ActiveRelation.php
index 97e2a8c..42ae0e7 100644
--- a/framework/db/ActiveRelation.php
+++ b/framework/db/ActiveRelation.php
@@ -131,7 +131,7 @@ class ActiveRelation extends ActiveQuery
 
 	/**
 	 * Finds the related records and populates them into the primary models.
-	 * This method is internally by [[ActiveQuery]]. Do not call it directly.
+	 * This method is internally used by [[ActiveQuery]]. Do not call it directly.
 	 * @param string $name the relation name
 	 * @param array $primaryModels primary models
 	 * @return array the related models
diff --git a/framework/web/UrlRule.php b/framework/web/UrlRule.php
index 53bd747..96cb994 100644
--- a/framework/web/UrlRule.php
+++ b/framework/web/UrlRule.php
@@ -125,7 +125,7 @@ class UrlRule extends Object
 				if (isset($this->defaults[$name])) {
 					$length = strlen($match[0][0]);
 					$offset = $match[0][1];
-					if ($this->pattern[$offset - 1] === '/' && $this->pattern[$offset + $length] === '/') {
+					if ($offset > 1 && $this->pattern[$offset - 1] === '/' && $this->pattern[$offset + $length] === '/') {
 						$tr["/<$name>"] = "(/(?P<$name>$pattern))?";
 					} else {
 						$tr["<$name>"] = "(?P<$name>$pattern)?";