Update to 0.4.3 and can't open workbooks

[Rovel]

Hi,

I just update the gem in my rails project and now I get this error as I try to:
wb = Workbook::Book.open(workbook_path)

NoMethodError: undefined method `[]' for #<RubyXL::ColumnRange:0x00007fed3b078340>
from /mypath/.asdf/installs/ruby/2.6.5/lib/ruby/gems/2.6.0/gems/workbook-0.4.3/lib/workbook/readers/xlsx_reader.rb:145:in `block (2 levels) in parse_xlsx'

Any help is appreciated