From 8c582153f8f3e1f678655e1e7c1c00d8ca86abff Mon Sep 17 00:00:00 2001
From: abdorizak <cabdirizaaqyare12@gmail.com>
Date: Sun, 30 Apr 2023 22:14:03 +0300
Subject: [PATCH] Fixed _CastError thrown while calling onChanged with null
 value #52

---
 lib/otp_field.dart | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/lib/otp_field.dart b/lib/otp_field.dart
index 279571d..f16ca88 100644
--- a/lib/otp_field.dart
+++ b/lib/otp_field.dart
@@ -241,8 +241,11 @@ class _OTPTextFieldState extends State<OTPTextField> {
             widget.onCompleted?.call(currentPin);
           }
 
-          // Call the `onChanged` callback function
-          widget.onChanged!(currentPin);
+          // Call the `onChanged` callback function -- deprecated
+          // widget.onChanged!(currentPin); this will cause _CastError which means onChanged is null
+
+          // Call the `onChanged` callback function if it exists
+          widget.onChanged?.call(currentPin);
         },
       ),
     );