diff --git a/src/Database/Adapter/MariaDB.php b/src/Database/Adapter/MariaDB.php
index cc7b5338c..ecfe4e3d5 100644
--- a/src/Database/Adapter/MariaDB.php
+++ b/src/Database/Adapter/MariaDB.php
@@ -798,8 +798,7 @@ public function createIndex(string $collection, string $id, string $type, array
                 ->prepare($sql)
                 ->execute();
         } catch (PDOException $e) {
-            $this->processException($e);
-            return false;
+            throw $this->processException($e);
         }
     }
 
diff --git a/src/Database/Adapter/Postgres.php b/src/Database/Adapter/Postgres.php
index 65d5c076e..2ef065d7b 100644
--- a/src/Database/Adapter/Postgres.php
+++ b/src/Database/Adapter/Postgres.php
@@ -851,8 +851,7 @@ public function createIndex(string $collection, string $id, string $type, array
                 ->prepare($sql)
                 ->execute();
         } catch (PDOException $e) {
-            $this->processException($e);
-            return false;
+            throw $this->processException($e);
         }
     }