Based on how it's worded it means whatever payload this method/function was trying to retrieve came back with a Null (nothing). Who knows why. Unless it was specifically documented, which is rarely ever done for things like this, even for the programmer who wrote the code they may have to look at it again to figure it out after the fact.? It would be a monumental effort to document every notice/warning thrown in a program and make it readable/understandable without context. Most of those types errors need to be fixed in the code (at one end or the other) and would require an update and likely not something tech support would be in position to assist with.
What I would find helpful is when bugs or things like this are reported that they're actually tracked and we have some involvement in or understanding of the status, if it's being looked into, has been fixed, won't be fixed etc. Online help really doesn't cut it for this.
