Robbing a grave is traditionally read as digging up the past for something of value. It can reflect unease about disturbing old memories or taking from what should be left alone.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.