Preventing Base64 Error "Invalid Length - must be multiple of four)" MarkerTap with missing fields

Hello everyone,

On googleMap Widget, I inserted Markers from a document and created a marker tap action that should open a bottom sheet. This sheet should show some further information from the document.

I am testing 3 Markers and the error occured initially at 2 of them. Upon filling out the field values, I could prevent the first and then the second error occurance. It disappeared for the one, where I filled out all values.

Now I deleted some values again but could not recreate this error.

What exactly might cause this error and how could I prevent these errors?