Cannot open any more vaults on macos from today morning

Author: YorghCreated Sep 11, 2026Updated Sep 15, 2026

Summary

I tried to open my vault today morning without being able to do it

Please agree to the following

I have searched existing issues for duplicates
I agree to follow this project's Code of Conduct

What software is involved?

Operating System: macOS Tahoe 26.6.2 (M1 - arm64)
Cryptomator: 1.19.3
macFuse : 5.3.3

The macFuse kernel extension is authorised on my macOS. Reinstalling macFuse and Cryptomator does not solve the issue even after a reboot. After reinstalling macFuse I am not asked to authorize the extensions as it is still in the security policy of my macOS.

Volume Type

macFUSE

Steps to Reproduce

Open Cryptomator
Try to unlock any vault
The error occurs

Expected Behavior

The Vault should unlock...

Actual Behavior

I get an error

Reproducibility

Always

Relevant Log Output

bash

Error Code 09TB:1357:L9IR
org.cryptomator.integrations.mount.MountFailedException: org.cryptomator.jfuse.api.FuseMountFailedException: fuse_loop() returned prematurely with non-zero exit code 0
	at [email protected]/org.cryptomator.frontend.fuse.mount.MacFuseMountProvider$MacFuseMountBuilder.mount(MacFuseMountProvider.java:145)
	at [email protected]/org.cryptomator.common.mount.Mounter.mount(Mounter.java:173)
	at [email protected]/org.cryptomator.common.vaults.Vault.unlock(Vault.java:187)
	at [email protected]/org.cryptomator.ui.keyloading.KeyLoadingStrategy.use(KeyLoadingStrategy.java:109)
	at [email protected]/org.cryptomator.ui.unlock.UnlockWorkflow.call(UnlockWorkflow.java:82)
	at [email protected]/org.cryptomator.ui.unlock.UnlockWorkflow.call(UnlockWorkflow.java:37)
	at [email protected]/javafx.concurrent.Task$TaskCallable.call(Unknown Source)
	at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
	at java.base/java.util.concurrent.CompletableFuture$UniAccept.tryFire(Unknown Source)
	at java.base/java.util.concurrent.CompletableFuture$Completion.run(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.base/java.lang.Thread.run(Unknown Source)
Caused by: org.cryptomator.jfuse.api.FuseMountFailedException: fuse_loop() returned prematurely with non-zero exit code 0
	at [email protected]/org.cryptomator.jfuse.api.Fuse.mount(Fuse.java:130)
	at [email protected]/org.cryptomator.frontend.fuse.mount.MacFuseMountProvider$MacFuseMountBuilder.mount(MacFuseMountProvider.java:142)
	... 12 more

Anything else?

I tried to use Fuse-T (v1.2.7) instead and I get quite the same error:

Error Code 09TB:8LNC:8MQR
org.cryptomator.integrations.mount.MountFailedException: org.cryptomator.jfuse.api.FuseMountFailedException: fuse_loop() returned prematurely with non-zero exit code -1
	at [email protected]/org.cryptomator.frontend.fuse.mount.FuseTMountProvider$FuseTMountBuilder.mount(FuseTMountProvider.java:139)
	at [email protected]/org.cryptomator.common.mount.Mounter.mount(Mounter.java:173)
	at [email protected]/org.cryptomator.common.vaults.Vault.unlock(Vault.java:187)
	at [email protected]/org.cryptomator.ui.keyloading.KeyLoadingStrategy.use(KeyLoadingStrategy.java:109)
	at [email protected]/org.cryptomator.ui.unlock.UnlockWorkflow.call(UnlockWorkflow.java:82)
	at [email protected]/org.cryptomator.ui.unlock.UnlockWorkflow.call(UnlockWorkflow.java:37)
	at [email protected]/javafx.concurrent.Task$TaskCallable.call(Unknown Source)
	at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
	at java.base/java.util.concurrent.CompletableFuture$UniAccept.tryFire(Unknown Source)
	at java.base/java.util.concurrent.CompletableFuture$Completion.run(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.base/java.lang.Thread.run(Unknown Source)
Caused by: org.cryptomator.jfuse.api.FuseMountFailedException: fuse_loop() returned prematurely with non-zero exit code -1
	at [email protected]/org.cryptomator.jfuse.api.Fuse.mount(Fuse.java:130)
	at [email protected]/org.cryptomator.frontend.fuse.mount.FuseTMountProvider$FuseTMountBuilder.mount(FuseTMountProvider.java:136)
	... 12 more

Debug logs are not more explicit to me :

11:37:51.578 [JavaFX Application Thread] DEBUG o.c.common.vaults.VaultStats - stop recording stats
11:37:51.581 [JavaFX Application Thread] DEBUG o.c.ui.fxapp.FxApplicationTerminator - Disabling sudden termination
11:37:51.598 [JavaFX Application Thread] DEBUG o.c.ui.fxapp.FxApplicationWindows - Start unlock workflow for MyVault
11:37:51.623 [JavaFX Application Thread] DEBUG o.cryptomator.common.CommonsModule - Starting App Background Thread 003
11:37:51.774 [App Background Thread 003] DEBUG o.c.cryptofs.common.BackupHelper - Verified backup file: /Users/myuser/Nextcloud/MyVault/masterkey.cryptomator.D44F6453.bkup
11:37:51.775 [App Background Thread 003] DEBUG o.c.cryptofs.common.BackupHelper - Verified backup file: /Users/myuser/Nextcloud/MyVault/vault.cryptomator.C594BBCA.bkup
11:37:51.775 [App Background Thread 003] DEBUG o.cryptomator.cryptofs.ReadonlyFlag - Vault opened for read and write.
11:37:51.776 [App Background Thread 003] DEBUG o.cryptomator.common.mount.Mounter - Using mount service org.cryptomator.frontend.fuse.mount.MacFuseMountProvider for mounting vault StringProperty [bean: org.cryptomator.common.settings.VaultSettings@aad550f8, name: displayName, value: MyVault]
11:37:51.778 [App Background Thread 003] DEBUG o.c.f.f.m.MacFuseMountProvider$MacFuseMountBuilder - Mounting CryptoFileSystem(/Users/myuser/Nextcloud/MyVault) using fuse library /usr/local/lib/libfuse.2.dylib with mountflags [-odefault_permissions, -ovolname=MyVault, -oauto_cache, -oauto_xattr, -ouid=503, -ogid=20, -onoappledouble, -oatomic_o_trunc]
11:37:52.191 [App Background Thread 003] TRACE org.cryptomator.common.vaults.Vault - Trying to close associated CryptoFS...
11:37:52.192 [JavaFX Application Thread] INFO  o.c.ui.unlock.UnlockWorkflow - Unlock of 'MyVault' failed.
11:37:52.192 [JavaFX Application Thread] ERROR o.c.ui.unlock.UnlockWorkflow - Unlock failed for technical reasons.
org.cryptomator.integrations.mount.MountFailedException: org.cryptomator.jfuse.api.FuseMountFailedException: fuse_loop() returned prematurely with non-zero exit code 0
	at [email protected]/org.cryptomator.frontend.fuse.mount.MacFuseMountProvider$MacFuseMountBuilder.mount(MacFuseMountProvider.java:145)
	at [email protected]/org.cryptomator.common.mount.Mounter.mount(Mounter.java:173)
	at [email protected]/org.cryptomator.common.vaults.Vault.unlock(Vault.java:187)
	at [email protected]/org.cryptomator.ui.keyloading.KeyLoadingStrategy.use(KeyLoadingStrategy.java:109)
	at [email protected]/org.cryptomator.ui.unlock.UnlockWorkflow.call(UnlockWorkflow.java:82)
	at [email protected]/org.cryptomator.ui.unlock.UnlockWorkflow.call(UnlockWorkflow.java:37)
	at [email protected]/javafx.concurrent.Task$TaskCallable.call(Unknown Source)
	at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
	at java.base/java.util.concurrent.CompletableFuture$UniAccept.tryFire(Unknown Source)
	at java.base/java.util.concurrent.CompletableFuture$Completion.run(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.base/java.lang.Thread.run(Unknown Source)
Caused by: org.cryptomator.jfuse.api.FuseMountFailedException: fuse_loop() returned prematurely with non-zero exit code 0
	at [email protected]/org.cryptomator.jfuse.api.Fuse.mount(Fuse.java:130)
	at [email protected]/org.cryptomator.frontend.fuse.mount.MacFuseMountProvider$MacFuseMountBuilder.mount(MacFuseMountProvider.java:142)
	... 12 common frames omitted
11:37:52.193 [JavaFX Application Thread] DEBUG o.c.common.vaults.VaultStats - stop recording stats
11:37:52.193 [JavaFX Application Thread] DEBUG o.c.ui.fxapp.FxApplicationTerminator - Enabling sudden termination
11:37:52.215 [JavaFX Application Thread] DEBUG o.c.ui.fxapp.FxApplicationWindows - visible windows: 2

I am stucked and need your help.

Source: cryptomator/cryptomator

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