diff --git a/app/src/main/java/me/impy/aegis/db/DatabaseManager.java b/app/src/main/java/me/impy/aegis/db/DatabaseManager.java
index e3818267..6f9dca22 100644
--- a/app/src/main/java/me/impy/aegis/db/DatabaseManager.java
+++ b/app/src/main/java/me/impy/aegis/db/DatabaseManager.java
@@ -29,6 +29,7 @@ public class DatabaseManager {
     }
 
     public void setMasterKey(MasterKey key) throws Exception {
+        assertLoaded();
         byte[] encrypted = _file.getContent();
         CryptParameters params = _file.getCryptParameters();
         CryptResult result = key.decrypt(encrypted, params);