diff --git a/bot/plugin_manager.py b/bot/plugin_manager.py
index 9e60b0a..a27652b 100644
--- a/bot/plugin_manager.py
+++ b/bot/plugin_manager.py
@@ -52,7 +52,7 @@ class PluginManager:
         plugin = self.__get_plugin_by_function_name(function_name)
         if not plugin:
             return json.dumps({'error': f'Function {function_name} not found'})
-        return json.dumps(await plugin.execute(function_name, **json.loads(arguments)))
+        return json.dumps(await plugin.execute(function_name, **json.loads(arguments)), default=str)
 
     def get_plugin_source_name(self, function_name) -> str:
         """