APEX

I am on APEX 21.1.5. I did try to reproduce my problem on apex.oracle.com, but I was unable to reproduce in that updated environment.

I have Interactive Grids to which the user can add new rows. These interactive grids filter on a FK. Here is an example:

On this particular example, I also have the following Edit settings:

Now, if and only if the IG opens with no records, I will get an error when I do the following:

1. Click “Add Row”
   
2. Click “Delete Row”
   
3. Click “Add Row” again

It shows me this message:

Looking in the console:

desktop_all.min.js?v=21.1.5:6 Uncaught TypeError: Cannot read properties of undefined (reading 'length')
   at Object.arrayEqual (desktop_all.min.js?v=21.1.5:6:2245)
   at a.<computed>.<computed>._select (interactiveGrid.min.js?v=21.1.5:7:78906)
   at a.<computed>.<computed>._select (desktop_all.min.js?v=21.1.5:28:6847)
   at interactiveGrid.min.js?v=21.1.5:7:58172

I am very novice when it comes to JavaScript, so I am unsure what to look for here. I will say, I haven't added any JavaScript code that in any way alters this IG programmatically. As shown, I am using ROWID as my PK (this is a legacy table that doesn't have a PK), and for some of my columns I set a default value, for example:

But that's all. I'm not doing anything particularly special or noteworthy. Here is some info about each of my columns (not including APEX$ROW_SELECTOR, APEX$ROW_ACTION, and ROWID):

• Hidden / NUMBER
• Hidden / NUMBER
• Hidden/ NUMBER
• Select List / VARCHAR2
• Number Field / NUMBER / Mask applied (FML999G999G999G999G990D00)
• Number Field / NUMBER / Mask applied (FML999G999G999G999G990D00)
• Display Only / VARCHAR2
• Display Only / DATE / Mask applied (MM/DD/YYYY HH:MI PM)
• Text Field / VARCHAR2

I reviewed the following:

• https://forums.oracle.com/ords/apexds/post/interactive-grid-getting-error-when-custom-delete-button-is-9537 - he is using a custom delete button, but I am not
• https://stackoverflow.com/questions/74988661/typeerror-cannot-read-properties-of-undefined-reading-length - not sure what to do with this… again, not using any custom JS
• https://stackoverflow.com/questions/71201363/uncaught-typeerror-cannot-read-properties-of-undefined-reading-length - this is in the context of a React app