Null Pointer Exception while filling out a text field

Question

Hello! 
 Does anyone know why a Null Exception Error is happening at this page? (see video) This is a form that's using a very simple logic for the text field. I checked the logs and didn't get anything there, so I tried remapping the record fields. That didn't work. The logic for this text field is very simple so I'm confused why it would give an error like this, see below. Thanks for any help in advance! 
 Also, let me know if you need any details on this, I'll be happy to provide them! 
 Code:

Tamara Saadeh · Accepted Answer

Checked the logs and found nothing there. I did fix it though! I'll include the fix on this reply since I'm unable to update my post 
 FIX: 
 I created two local variables on the parent interface, which then got sent down to the children interfaces, all the way down to the interface where the textfield is erroring out. 
 Instead of saving directly to the record as in the original post, I saved to the local variable getting passed down from the parent interface as rule inputs. 
 In the parent interface's save expression, I basically used a save() where the local variables were mapped to the fields there. Below is a screenshot of what I'm talking about

crossed out some values for client confidentiality purposes 
 Thank you Stefan Helzle for your help!

Varun Teja Gurrapu · Answer

HI Tamara Saadeh , The value property of a!textField might be null, and some operations are being performed on it without handling null cases. Since this rule is called by others, check if data is being passed correctly between them. I don't see any mistake made in code, maybe due to null data being passed into v alue / saveInto parameter. Ensure ri!otherUser is not null before accessing .companyWebsite write value : a!defaultValue(ri!otherUser.companyWebsite, ""), to avoid null values, try using "" in validations instead of {}. Hope this helps you!!!

Null Pointer Exception while filling out a text field

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