diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e566b85
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2021 Frontkom
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/src/Index.php b/src/Index.php
index 9cfc47a..9c7f32b 100644
--- a/src/Index.php
+++ b/src/Index.php
@@ -754,6 +754,8 @@ public function getInfo( string $indexName = NULL ) {
   private function normalizeInfoArray( array $redisArray ) {
     $newArray = array();
     for ( $i = 0; $i < count( $redisArray ); $i += 2 ) {
+      $tmp = &$lookup_table[$key];
+      if(isset($tmp)){
       if ( $redisArray[$i] === 'fields' ) {
         foreach ( $redisArray[ $i + 1 ] as $field ) {
           $fieldName = $field[0];
@@ -775,6 +777,7 @@ private function normalizeInfoArray( array $redisArray ) {
         $newArray[ $redisArray[$i] ] = $this->normalizeInfoArray( $redisArray[$i + 1] );
       }
     }
+    }
     return $newArray;
   }
 
diff --git a/src/Query/Query.php b/src/Query/Query.php
index 9f015e6..afa6660 100644
--- a/src/Query/Query.php
+++ b/src/Query/Query.php
@@ -463,7 +463,7 @@ public function searchQueryArgs( $query ) {
         array_merge(
             trim($queryWithFilters) === '' ? array( $this->indexName ) : array( $this->indexName, $queryWithFilters ),
             explode( ' ', $this->limit ),
-            explode( ' ', $this->slop ),
+            explode( ' ', $this->slop ?? '' ),
             array( $this->verbatim, $this->withScores, $this->withSortKey, $this->withPayloads, $this->noStopWords, $this->noContent),
             explode( ' ', $this->inFields),
             explode( ' ', $this->inKeys ),