diff --git a/pyrogram/client/client.py b/pyrogram/client/client.py
index 4581371d..ca3fb1e0 100644
--- a/pyrogram/client/client.py
+++ b/pyrogram/client/client.py
@@ -370,7 +370,7 @@ class Client:
             self.phone_code = (
                 input("Enter phone code: ") if self.phone_code is None
                 else self.phone_code if type(self.phone_code) is str
-                else self.phone_code()
+                else str(self.phone_code())
             )
 
             try: