diff --git a/main/ui/src/main/java/org/cryptomator/ui/common/VaultService.java b/main/ui/src/main/java/org/cryptomator/ui/common/VaultService.java
index 35ed49870..1f4ffc3fd 100644
--- a/main/ui/src/main/java/org/cryptomator/ui/common/VaultService.java
+++ b/main/ui/src/main/java/org/cryptomator/ui/common/VaultService.java
@@ -65,6 +65,7 @@ public class VaultService {
 	public Task<Vault> createLockTask(Vault vault, boolean forced) {
 		Task<Vault> task = new LockVaultTask(vault, forced);
 		task.setOnSucceeded(evt -> LOG.info("Locked {}", vault.getDisplayName()));
+		task.setOnFailed(evt -> LOG.info("Failed to lock {}.", vault.getDisplayName(), evt.getSource().getException()));
 		return task;
 	}