problem with user defined function using dictionary

Basically g:CCT is dictionary of dicionary items, and each item is
list.

now the problem is, if i open a c file normally and invoke the CLadd()
function it works.

But if i open the file from cscope list and call CLadd()function, i am
getting the following error.

au BufReadPre *.[ch]
\ if exists('CCR')
\ | let g:CCT = eval(CCR)
\ | let g:CCKey = (keys(g:CCT))[0]

au BufWritePost *.[ch]
\ | let g:CCR = string(g:CCT)

fun! CLadd()
let bufn = bufname('.')

if (!has_key(g:CCT, g:CCkey))
echo "No keys"
return
endif

if (!has_key(g:CCT[g:CCkey], bufn))
let g:CCT[g:CCkey][bufn] = []
endif

for entry in g:CCT[g:CCkey][bufn]
if (entry[1] == save_cursor[1])
return
endif
endfor

call add(g:CCT[g:CCkey][bufn], save_cursor)
endfun

Error detected while processing function CLadd:
line 09:
E713: Cannot use empty key for Dictionary
line 12:
E713: Cannot use empty key for Dictionary
E15: Invalid expression: g:CCT[g:CCKey][bufn]
line 18:
E713: Cannot use empty key for Dictionary
E116: Invalid arguments for function add

i immediately printed the CCKey value, it has a valid
key value.

:echo g:CCKey
key1

what's the problem here.

-sinbad

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