Panic while saving service store: encodeReflectValue: nil element

[geertw]

Occasionally, the following error is returned while saving stores during shutdown

ERRO[671056] Error while saving stores   error="gob: encodeReflectValue: nil element"

This can be traced down to a panic while saving the service store. There appears to be a nil reference somewhere in the store. It is yet unknown whether this is in the store itself, or in the underlying service models.

Steps taken so far:

• Removed all nil references which still existed
• Wrote a specific unit test where services were deleted from the store
• Return a copy of store.services when saving

This issue is meant to track any additional findings.

[geertw]

Auto-saving has been enabled since May, and this problem doesn't seem to occur anymore. Will close this issue soon if the problem doesn't manifest itself soon.