svn 1.7 assertion failed

[ponomarenko yaroslav]

Got this error while trying svn cleanup
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svn: E235000: In file 
'D:\Development\SVN\Releases\TortoiseSVN-1.7.0\ext\subversion\subversion\libsvn_wc\workqueue.c'
 line 672: assertion failed (checksum != NULL)
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win7 64
Is there a way to recover?