Reproduced in 1.3.4
ric
PS btw thanks Waldek and you all for 1.3.5

                       FriCAS Computer Algebra System
                            Version: FriCAS 1.3.4
                  Timestamp: Wed Jun 27 13:40:07 CEST 2018
-----------------------------------------------------------------------------
   Issue )copyright to view copyright notices.
   Issue )summary for a summary of useful system commands.
   Issue )quit to leave FriCAS and return to shell.
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Type: Void

(1) -> sum(sum(a^k, a=1..k), k=1..n)
   - log(%C)
>> Error detected within library code:
   Hidden constant detected

(1) -> sum(sum(a^k, a=1..k), k=1..10)
   - log(%C)
>> Error detected within library code:
   Hidden constant detected

(1) -> sum(a^k, a=1..k)

          k
         ──┐    k
   (1)   >     a
         ──┘
        a = 1
                                                    Type: Expression(Integer)
(2) -> f(k)==sum(a^k, a=1..k)
                                                                   Type: Void
(3) -> sum(f(k), k=1..n)
   Compiling function f with type Variable(k) -> Expression(Integer)
   - log(%C)
>> Error detected within library code:
   Hidden constant detected

(3) -> f(3)
   Compiling function f with type PositiveInteger -> Fraction(
      Polynomial(Integer))

   (3)  36
                                          Type: Fraction(Polynomial(Integer))
(4) ->

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