Variable name is too long and causes SQL error

I have a content type called wedstrijdverslag created using CCK.
This results in a content type internally called content_wedstrijdverslag.
when activating show taxonomy breadcrumb for this content type, you make a variable called taxonomy_context_breadcrumb_content_wedstrijdverslag.

This variable is too long to fit into the variable table

The first time it gets inserted without any problem as MySQL automatically truncates the value to:
'taxonomy_context_breadcrumb_content_wedstrijdver'
When you update the settings an error occurs as your code tries to do an insert again because for him, the variable does not exists (as it is truncated)
The insert error states duplicate entry as while inserting the long variable for the second time, it gets truncated again and MySql finds the previous truncated value and thus give this error

user warning: Duplicate entry 'taxonomy_context_breadcrumb_content_wedstrijdver' for key 1 query: INSERT INTO variable (name, value) VALUES ('taxonomy_context_breadcrumb_content_wedstrijdverslag', 's:1:\"1\";') in /drupal-4.7.4/includes/database.mysql.inc on line 121

Maybe this can be avoided by altering the code so that the variable names get shorter for example use tacbc_content_wedstrijdverslag instead of taxonomy_context_breadcrumb_content_wedstrijdverslag