Are you trying to add an empty textbox? Put a zero in it.
Their is no textbox component
Look in your blocks. Where are you trying to add something to 10 ?
Nothing obvious.
You will have to debug your blocks step by step, to find out where/when the error occurs
Thanks
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And in the blocks shown below, the number has been changed to 1... 
In case you haven't solved it, the problem was blank in globalno.
Most of the time that is caused by a TinyDB load of globalno with a default of blank if not found.
For a counter, the default should be 0.
You might have to go into TinyDB and set the value to 0, if you saved that blank back to TinyDB.
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