[TYPO3-dev] felogin - kb_md5fepw: after update to t3 4.2.4 not working any more

[grac]

hi

this is very annoying: this morning i made the requested update to typo3 
version 4.2.4

and now the felogin doesn't work any more: no redirect any more.

and an error message (no matter how i change the redirect possibilities 
in felogin):


caller     
t3lib_DB::exec_INSERTquery

ERROR    
Duplicate entry 'b0932976f962a02c71442f7ff643545c' for key 'PRIMARY'

lastBuiltQuery     INSERT INTO tx_kbmd5fepw_challenge
(
challenge,
tstamp
) VALUES (
'b0932976f962a02c71442f7ff643545c',
'1232537555'
)

debug_backtrace    
require#76 // tslib_fe->INTincScript#461 // 
tslib_fe->INTincScript_process#3012 // tslib_cObj->USER#3086 // 
tslib_cObj->callUserFunction#720 // call_user_func_array#5862 // 
tx_felogin_pi1->main# // tx_felogin_pi1->showLogin#114 // 
t3lib_div::callUserFunction#285 // call_user_func_array#4489 // 
tx_kbmd5fepw_newloginbox->loginFormOnSubmit# // 
t3lib_DB->exec_INSERTquery#81 // t3lib_DB->debug#181


i understand that the EXT kb_md5fepw is not hosted any more.
but i can't just uninstall the EXT because YAML (db_yamltv) depends on 
it. and i can and will not uninstall this EXT because everything in my 
installations is built on it.

so are there any hints where to look?
in order to make my websites work again?

thanks for any hint and help
stephan