Your key-value pair value should be a string, not a Number, Array or Object.
Step 1: Open the webpage and check the source code (right click > view page source).
Step 2: Search for the key-value pair in question and update per below example:
Current code: setKvp('one', 1); Should be changed to: setKvp('one', '1');
Notice how the (‘ ‘) have been added to correct it.