style error while setting width in case of rowSpan and colSpan

Hi,
I am building a simple bootstrap table but getting the following error
"Uncaught TypeError: Cannot read property 'style' of undefined".

I am getting this error whenever i am setting the width of the last row.
Here is my error code:


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Here is my Working Code


I need to assign width for the last row.
I am using Chrome with react: 15.4.1 and react-bootstrap-table: 2.11.2,

Can you help me with this..??