crash when closing "New Unshared"

[Jacob Burckhardt <bjacob startrekmail com>]

Package: gnumeric
Version: 0.59

These steps cause gnumeric to crash:

1. Run gnumeric.
2. In the View menu, select "New Unshared".
3. In the new window, in the File menu, select Close.

It says:

** CRITICAL **: file workbook-format-toolbar.c: line 884 (workbook_feedback_set): assertion `style != NULL' 
failed.

I am using Red Hat Linux 7.0