The umbrella is traditionally read as protection from emotional weather. An open one stands for shelter and readiness; a broken one, for feeling exposed despite your preparations.
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.