- Fixed a bug where default value was set to empty instead of nothing

src/Adapter/SQLite.php

@@ -134,7 +134,7 @@ class SQLite implements AdapterInterface, MigrateInterface, SqlAdapterInterface
         }
 
         if (in_array($type, [ 'JSON', 'TEXT', 'BLOB', 'GEOMETRY' ])) {
-            $field->default = "";
+            unset($field->default);
         }
 
         return $typeOnly ? $type : $type . ( $length ? "($length" . ")" : "" );