json_decode returnning NULL

Here response from API server :- [{"Message":"{*} Mobile No should be unique."}]

Json_decode

var_dump(json_decode($response));

Here is output

NULL NULL NULL

Main thing here is, when getting response from server, json_decode() returning NULL,

If i copy respone and assign to variable like below, json_decode() works fine :-

$someJSON = '[{"Message":"{*} Mobile No should be unique."}]';

Please help

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