diff --git a/data/src/main/java/org/cryptomator/data/cloud/crypto/MasterkeyCryptoCloudProvider.kt b/data/src/main/java/org/cryptomator/data/cloud/crypto/MasterkeyCryptoCloudProvider.kt
index e7c214e2..5699a95b 100644
--- a/data/src/main/java/org/cryptomator/data/cloud/crypto/MasterkeyCryptoCloudProvider.kt
+++ b/data/src/main/java/org/cryptomator/data/cloud/crypto/MasterkeyCryptoCloudProvider.kt
@@ -19,6 +19,7 @@ import org.cryptomator.domain.Vault
 import org.cryptomator.domain.exception.BackendException
 import org.cryptomator.domain.exception.CancellationException
 import org.cryptomator.domain.exception.FatalBackendException
+import org.cryptomator.domain.exception.vaultconfig.MissingVaultConfigFileException
 import org.cryptomator.domain.exception.vaultconfig.UnsupportedMasterkeyLocationException
 import org.cryptomator.domain.repository.CloudContentRepository
 import org.cryptomator.domain.usecases.ProgressAware
@@ -204,10 +205,16 @@ class MasterkeyCryptoCloudProvider(
 	}
 
 	private fun assertLegacyVaultVersionIsSupported(version: Int) {
-		if (version < CryptoConstants.MIN_VAULT_VERSION) {
-			throw UnsupportedVaultFormatException(version, CryptoConstants.MIN_VAULT_VERSION)
-		} else if (version > CryptoConstants.MAX_VAULT_VERSION_WITHOUT_VAULT_CONFIG) {
-			throw UnsupportedVaultFormatException(version, CryptoConstants.MAX_VAULT_VERSION_WITHOUT_VAULT_CONFIG)
+		when {
+			version < CryptoConstants.MIN_VAULT_VERSION -> {
+				throw UnsupportedVaultFormatException(version, CryptoConstants.MIN_VAULT_VERSION)
+			}
+			version == CryptoConstants.DEFAULT_MASTERKEY_FILE_VERSION -> {
+				throw MissingVaultConfigFileException()
+			}
+			version > CryptoConstants.MAX_VAULT_VERSION_WITHOUT_VAULT_CONFIG -> {
+				throw UnsupportedVaultFormatException(version, CryptoConstants.MAX_VAULT_VERSION_WITHOUT_VAULT_CONFIG)
+			}
 		}
 	}
 
diff --git a/domain/src/main/java/org/cryptomator/domain/exception/vaultconfig/MissingVaultConfigFileException.java b/domain/src/main/java/org/cryptomator/domain/exception/vaultconfig/MissingVaultConfigFileException.java
new file mode 100644
index 00000000..0c0c6833
--- /dev/null
+++ b/domain/src/main/java/org/cryptomator/domain/exception/vaultconfig/MissingVaultConfigFileException.java
@@ -0,0 +1,6 @@
+package org.cryptomator.domain.exception.vaultconfig;
+
+import org.cryptomator.domain.exception.BackendException;
+
+public class MissingVaultConfigFileException extends BackendException {
+}
diff --git a/presentation/src/main/java/org/cryptomator/presentation/exception/ExceptionHandlers.kt b/presentation/src/main/java/org/cryptomator/presentation/exception/ExceptionHandlers.kt
index 024d3bbb..abf0f223 100644
--- a/presentation/src/main/java/org/cryptomator/presentation/exception/ExceptionHandlers.kt
+++ b/presentation/src/main/java/org/cryptomator/presentation/exception/ExceptionHandlers.kt
@@ -19,6 +19,7 @@ import org.cryptomator.domain.exception.license.NoLicenseAvailableException
 import org.cryptomator.domain.exception.update.GeneralUpdateErrorException
 import org.cryptomator.domain.exception.update.HashMismatchUpdateCheckException
 import org.cryptomator.domain.exception.update.SSLHandshakePreAndroid5UpdateCheckException
+import org.cryptomator.domain.exception.vaultconfig.MissingVaultConfigFileException
 import org.cryptomator.domain.exception.vaultconfig.UnsupportedMasterkeyLocationException
 import org.cryptomator.domain.exception.vaultconfig.VaultConfigLoadException
 import org.cryptomator.domain.exception.vaultconfig.VaultKeyInvalidException
@@ -41,7 +42,6 @@ class ExceptionHandlers @Inject constructor(private val context: Context, defaul
 		staticHandler(NetworkConnectionException::class.java, R.string.error_no_network_connection)
 		staticHandler(InvalidPassphraseException::class.java, R.string.error_invalid_passphrase)
 		staticHandler(CloudNodeAlreadyExistsException::class.java, R.string.error_file_or_folder_exists)
-		staticHandler(UnsupportedVaultFormatException::class.java, R.string.error_vault_version_not_supported)
 		staticHandler(VaultAlreadyExistException::class.java, R.string.error_vault_already_exists)
 		staticHandler(ActivityNotFoundException::class.java, R.string.error_activity_not_found)
 		staticHandler(CloudAlreadyExistsException::class.java, R.string.error_cloud_already_exists)
@@ -54,6 +54,13 @@ class ExceptionHandlers @Inject constructor(private val context: Context, defaul
 		staticHandler(HashMismatchUpdateCheckException::class.java, R.string.error_hash_mismatch_update)
 		staticHandler(GeneralUpdateErrorException::class.java, R.string.error_general_update)
 		staticHandler(SSLHandshakePreAndroid5UpdateCheckException::class.java, R.string.error_general_update)
+		staticHandler(UnsupportedVaultFormatException::class.java, R.string.error_vault_version_not_supported)
+		staticHandler(
+			MissingVaultConfigFileException::class.java, String.format(
+				ResourceHelper.getString(R.string.error_vault_config_file_missing_due_to_format_999),
+				ResourceHelper.getString(R.string.vault_cryptomator)
+			)
+		)
 		staticHandler(
 			VaultVersionMismatchException::class.java, String.format(
 				ResourceHelper.getString(R.string.error_vault_version_mismatch),
diff --git a/presentation/src/main/res/values/strings.xml b/presentation/src/main/res/values/strings.xml
index 19c2638e..febc50ca 100644
--- a/presentation/src/main/res/values/strings.xml
+++ b/presentation/src/main/res/values/strings.xml
@@ -18,6 +18,7 @@
 	<string name="error_invalid_passphrase">Wrong password</string>
 	<string name="error_file_or_folder_exists">A file or folder already exists.</string>
 	<string name="error_vault_version_not_supported">Unsupported vault. This vault has been created with another version of Cryptomator.</string>
+	<string name="error_vault_config_file_missing_due_to_format_999">%1$s file is missing in your vault folder. Make sure that this file exists in your vault folder in the cloud.</string>
 	<string name="error_vault_already_exists">Vault already exists.</string>
 	<string name="error_no_such_file">File does not exist.</string>
 	<string name="error_vault_has_been_locked">Vault has been locked.</string>