Exception: Error calculating input for field 'title': Formula received a nil value: undefined method `+' for nil:NilClass
What does this mean?:
What this implies is that in one of the step's field, there lies a formula mode value that has caused the recipe to fail. Most of the time this happens when you tried to have normal strings and selective edata pills (This OR that) together. Here's an example, and how to identify which step is throwing that error. (Note that Step 6 is not Step 8 in the next animation. If this is your first time attempting to identify an error, please check out this article on how to identify which step is throwing error.
When I go the step, I see that I am using a two data pills concatenated between two strings (A string is a normal sentence that is embodied within a double or single quotes in formula mode. Strings cannot be used for value, date, or boolean comparison, but can only be treated literary). By taking a look at the data pills, it may be that both data pills are empty for this particular record, and causes the formula mode to fail.
To fix this case, we need to ensure that either the logic always return a value, or makes sure that the data pill that I used will always return a certain value.
That's it! The most important thing would be to figure out if the formula mode done correctly.