Another integral with exact same problem:

(1) -> integrate((k*x^2 - 1)/((a*k*x + b)*(b*x + a)*sqrt((1 - x^2)*(1
- k^2*x^2))), x)

   >> Error detected within library code:
   catdef: division by zero

Under FriCAS 1.2.7, this integral returns after 1 minute.

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