gap> g:=Group((1,7)(2,5)(3,6)(4,8), (1,5,3,7,2,8,4,6));;
gap> u:=Stabilizer(g,1);;
gap> pc:=PermutationCharacter(g,u);
Error, Variable: 'cl' must have a value at
Add( c,
Number( DoubleCosets( G, U, Subgroup( Parent( G ), [ cl[i].representative ]
) ), function ( x ) ... end ) ) ... in
GroupOps.PermutationCharacter( arg[1], arg[2] ) called from
arg[1].operations.PermutationCharacter( arg[1], arg[2] ) called from
PermutationCharacter( g, u ) called from
main loop
brk> quit;

(Running on Gap3.4, patchlevel 1)