Update problems 5 to 6 with book module...

We are getting dreadfully frustrated in our attempt to update from 5.19 to 6.13. We have received several errors, but the one we can't resolve seems to center on the book module. FYI, this site has a lot of posts and began as a Drupal 4.3 site; we have followed very closely the steps required to update to a new version of Drupal, including making incremental steps from 5.19 to 6.0 to 6.13. The short explanation for what's happening is that the book module seems to cause problems when we run update.php, we get messages that updating sequence was aborted and/or that there are unresolved errors. CAN ANYONE HELP?

Here, in sequence and in detail, are the errors we received:

1. On our first try from Drupal 5.19 to Drupal 6.0 (all contrib modules disabled; all optional core modules left on; all drupal 5 folders removed; all drupal 6 folders moved to proper directory; admin user;) update.php function yielded these messages:

An error occurred. LOCALHOST URL HERE/update.php?id=1&op=do
Fatal error: Unsupported operand types in /LOCALHOST URL HERE/modules/book/book.install on line 218

Additional message on update page: The update process was aborted prematurely while running update #6000 in book.module. All errors have been logged. You may need to check the watchdog database table manually.

On error page:

* user warning: Duplicate entry '392-0-' for key 1 query: ALTER TABLE poll_votes ADD PRIMARY KEY (nid, uid, hostname) in /LOCALHOST URL HERE/includes/database.mysql-common.inc on line 374.
* warning: array_merge() [function.array-merge]: Argument #2 is not an array in /LOCALHOST URL HERE/modules/book/book.install on line 205.

2. Unchecked book in module list and ran update.php again, received this error:

An error occurred. LOCALHOST URL HERE/update.php?id=2&op=do
Fatal error: Unsupported operand types in /LOCALHOST URL HERE/modules/book/book.install on line 218

Additional message on update page: The update process was aborted prematurely while running update #6000 in book.module. All errors have been logged. You may need to check the watchdog database table manually.

corresponding log notes:
array_merge() [function.array-merge]: Argument #2 is not an array in /LOCALHOST URL HERE/modules/book/book.install on line 205.

Error page notes:

* user warning: Duplicate entry '392-0-' for key 1 query: ALTER TABLE poll_votes ADD PRIMARY KEY (nid, uid, hostname) in /LOCALHOST URL HERE/includes/database.mysql-common.inc on line 374.
* warning: array_merge() [function.array-merge]: Argument #2 is not an array in /LOCALHOST URL HERE/modules/book/book.install on line 205.

3. While we had gotten those update errors, we did bang on the test site pretty hard and it seemed to be working OK. We also went through many of the hundreds of book nodes that we have and they all seemed to be working OK. We also created new book nodes and, again, it seemed to be working. However, it worried us that we had this error and problem during the updating and wanted to get to the bottom of it.

A couple of forums suggested we jump to 6.13. So we did, again this would be an upgrade from 6.0. After a hiccup with the taxonomy module, (we activated the taxonomy module and tried again and that seemed to resolve what appeared to be a sequencing issue with forum module) we got this error. (FYI, the book module was enabled):

Fatal error: Unsupported operand types in /LOCALSITE URL HERE/modules/book/book.install on line 218

From error logs:
* user warning: Table 'book_temp' already exists query: CREATE TABLE book_temp ( `nid` INT unsigned NOT NULL DEFAULT 0, `parent` INT NOT NULL DEFAULT 0, `weight` TINYINT NOT NULL DEFAULT 0, PRIMARY KEY (nid), INDEX parent (parent) ) /*!40100 DEFAULT CHARACTER SET UTF8 */ in /LOCALSITE URL HERE/includes/database.inc on line 517.
* user warning: Unknown column 'b.parent' in 'field list' query: INSERT INTO book_temp (nid, parent, weight) SELECT b.nid, b.parent, b.weight FROM book b INNER JOIN node n on b.vid = n.vid in /LOCALSITE URL HERE/modules/book/book.install on line 127.
* warning: array_merge() [function.array-merge]: Argument #2 is not an array in /LOCALSITE URL HERE/modules/book/book.install on line 205.

Again, can anyone help with this?

Thanks so much in advance,

Geoff Gevalt