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Manish Tripathi 20Manish Tripathi 20 

Contact Duplicate merge issue

I have Master list holding All those contact data having email is null.I want to keep only one record from this list and then i have to delete this list . I applied with for each loop on this master lish so that i can get one record and and in one list and delete master ,but it is giving me error that 
System.ListException: Duplicate id in list: 0035g000008iqPAAAY
, how can I achieve this.
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AbhinavAbhinav (Salesforce Developers) 
Hi Manish,

Please add a more relevent details in such a way that we can replicate issue at our end.

Thanks!