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I have added a new method in a class and added test data in the test class . It was PASS when I Ran the test class in Sandbox.

However , when I'm trying to deploy in Prod through Change Set, It's giving me "Null pointer Exception " error .

System.NullPointerException: Attempt to de-reference a null object Stack Trace: Class.MyClass.MyNewMethod: line 516, column 1 Class.MyClassTest.MyTestMethod: line 73, column 1

MyNewMethod is the same method which I have written newly and trying to deploy.

Please suggest why such error.

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    If you don't share any code it will be hard for us to know why the code threw a null pointer exception – Mihai Neagoe Apr 20 '15 at 10:31
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    Please share your code. You need to put null checks through out the class. – Nilesh Mane Apr 20 '15 at 11:05
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Best guess is that you have a hard-coded ID in your test from the sandbox that will be different or non-existent in production.

You will need to remove all hard-coded IDs from the tests and make them org independant by setting up the required test data within the test.

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