crash in 1.8.1 on commit

Hi,

crash reports for 1.8.1 are coming in now. Top crash right now is this:
https://www.crash-server.com/Problem.aspx?ClientID=tsvn&ProblemID=31426

> libsvn_tsvn.dll!svn_path_join_internal(const char * base=0xfffffffffcfcc6f7, const char * component=0x0000000000000000, apr_pool_t * pool=0x0000000003033880) Line 115 C
> libsvn_tsvn.dll!checkout_dir(dir_context_t * dir=0x0000000003017e78, apr_pool_t * scratch_pool=0x0000000002fce380) Line 403 C
> libsvn_tsvn.dll!delete_entry(const char * path=0x000007fedc1f7708, long revision=50429560, void * parent_baton=0x0000000003033880, apr_pool_t * pool=0x000007fedc1f7708) Line 1546 C
> libsvn_tsvn.dll!do_item_commit(void * * dir_baton=0x0000000003f5ebb8, void * parent_baton=0x0000000003033880, void * callback_baton=0x0000000003f5ec70, const char * path=0x0000000002fcc3a8, apr_pool_t * pool=0x0000000003039838) Line 1590 C
> libsvn_tsvn.dll!svn_delta_path_driver2(const svn_delta_editor_t * editor=0x000000000301f7e0, void * edit_baton=0x0000000002fce6a0, const apr_array_header_t * paths=0x0000000003031870, int sort_paths=50438336, svn_error_t * (void * *, void *, void *, const char *, apr_pool_t *) * callback_func=0x000007fede5ebbd0, void * callback_baton=0x0000000003f5ec70, apr_pool_t * pool=0x000000000301f768) Line 263 C
> libsvn_tsvn.dll!svn_client__do_commit(const char * base_url=0x0000000002fcc310, const apr_array_header_t * commit_items=0x000000000302f7e8, const svn_delta_editor_t * editor=0x0000000002fce6a0, void * edit_baton=0x0000000002fce380, const char * notify_path_prefix=0x0000000003017960, apr_hash_t * * sha1_checksums=0x0000000003f5eda8, svn_client_ctx_t * ctx=0x000000000301a0c0, apr_pool_t * result_pool=0x00000000030176f8, apr_pool_t * scratch_pool=0x000000000301f768) Line 1808 C
> libsvn_tsvn.dll!svn_client_commit6(const apr_array_header_t * targets=0x0000000003017770, svn_depth_t depth=34, int keep_locks=0, int keep_changelists=0, int commit_as_operations=1, int include_file_externals=0, int include_dir_externals=0, const apr_array_header_t * changelists=0x0000000003017770, const apr_hash_t * revprop_table=0x0000000000000000, svn_error_t * (const svn_commit_info_t *, void *, apr_pool_t *) * commit_callback=0x000000013f3cc770, void * commit_baton=0x0000000000158de0, svn_client_ctx_t * ctx=0x000000000301a0c0, apr_pool_t * pool=0x00000000030176f8) Line 965 C

the dir->parent_dir->working_url in libsvn_ra_serf/commit.c, line 402 is
NULL which makes svn_path_join_internal access the null pointer.

Stefan

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