diff --git a/platform-darwin/Source/MPAlgorithmV0.m b/platform-darwin/Source/MPAlgorithmV0.m
index e9279f11..d3747ee3 100644
--- a/platform-darwin/Source/MPAlgorithmV0.m
+++ b/platform-darwin/Source/MPAlgorithmV0.m
@@ -146,10 +146,10 @@ static NSOperationQueue *_mpwQueue = nil;
 
 - (NSString *)nameOfType:(MPResultType)type {
 
-    if (!type)
-        return nil;
-
     switch (type) {
+        case MPResultTypeNone:
+            return @"None";
+
         case MPResultTypeTemplateMaximum:
             return @"Maximum Security Password";
 
@@ -189,10 +189,10 @@ static NSOperationQueue *_mpwQueue = nil;
 
 - (NSString *)shortNameOfType:(MPResultType)type {
 
-    if (!type)
-        return nil;
-
     switch (type) {
+        case MPResultTypeNone:
+            return @"None";
+
         case MPResultTypeTemplateMaximum:
             return @"Maximum";
 
@@ -237,9 +237,6 @@ static NSOperationQueue *_mpwQueue = nil;
 
 - (Class)classOfType:(MPResultType)type {
 
-    if (!type)
-        Throw( @"No type given." );
-
     switch (type) {
         case MPResultTypeTemplateMaximum:
             return [MPGeneratedSiteEntity class];
@@ -271,6 +268,7 @@ static NSOperationQueue *_mpwQueue = nil;
         case MPResultTypeStatefulDevice:
             return [MPStoredSiteEntity class];
 
+        case MPResultTypeNone:
         case MPResultTypeDeriveKey:
             break;
     }
@@ -322,6 +320,7 @@ static NSOperationQueue *_mpwQueue = nil;
             return MPResultTypeStatefulDevice;
         case MPResultTypeStatefulDevice:
             return MPResultTypeTemplatePhrase;
+        case MPResultTypeNone:
         case MPResultTypeDeriveKey:
             break;
     }
@@ -531,8 +530,13 @@ static NSOperationQueue *_mpwQueue = nil;
             return;
         }
 
-        case MPResultTypeDeriveKey:
+        case MPResultTypeNone:
+        case MPResultTypeDeriveKey: {
+            PearlNotMainQueue( ^{
+                resultBlock( nil );
+            } );
             return;
+        }
     }
 
     Throw( @"Type not supported: %lu", (long)type );