i am initialize these variable with some default value and then will the same problem exists? and for the default key combination also hash have some value like

 my $value1 = 'x';
my $value2 = 'x';
my $value3 = 'x';
my $value4 = 'x';

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#code where actual value will be assigened to the variables and only $
+value2 didnt get assigned to any value so $value2='x' itself
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my @value = @{$Config {'hai','x','there','bye'}};
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if my has have a value for thsi key also will it be an issue?