Hopefully implemented a proper workaround for new Mojave permissions required for the Media Key event hook. We shouldn't crash any more.

Application/MediaKeysApplication.m

@@ -32,8 +32,18 @@
                                                context:nil];
 
     keyTap = [[SPMediaKeyTap alloc] initWithDelegate:self];
-    if([SPMediaKeyTap usesGlobalMediaKeyTap])
-        [keyTap startWatchingMediaKeys];
+    if([SPMediaKeyTap usesGlobalMediaKeyTap]) {
+        NSAlert *alert = [[NSAlert alloc] init];
+        [alert addButtonWithTitle:@"Retry"];
+        [alert addButtonWithTitle:@"Cancel"];
+        [alert setMessageText:@"Enable Media Key access?"];
+        [alert setInformativeText:@"Media Key support requires the \"Accessibility\" permission."];
+        [alert setAlertStyle:NSInformationalAlertStyle];
+        while (![keyTap startWatchingMediaKeys]) {
+            if ([alert runModal] == NSAlertFirstButtonReturn) continue;
+            else break;
+        }
+    }
     else
         ALog(@"Media key monitoring disabled");
 }

ThirdParty/SPMediaKeyTap/SPMediaKeyTap.h

@@ -23,7 +23,7 @@
 -(id)initWithDelegate:(id)delegate;
 
 +(BOOL)usesGlobalMediaKeyTap;
--(void)startWatchingMediaKeys;
+-(BOOL)startWatchingMediaKeys;
 -(void)stopWatchingMediaKeys;
 -(void)handleAndReleaseMediaKeyEvent:(NSEvent *)event;
 

ThirdParty/SPMediaKeyTap/SPMediaKeyTap.m

@@ -60,7 +60,7 @@ static CGEventRef tapEventCallback(CGEventTapProxy proxy, CGEventType type, CGEv
        _app_switching_ref = NULL;
 }
 
--(void)startWatchingMediaKeys;{
+-(BOOL)startWatchingMediaKeys;{
     // Prevent having multiple mediaKeys threads
     [self stopWatchingMediaKeys];
 
@@ -74,13 +74,22 @@ static CGEventRef tapEventCallback(CGEventTapProxy proxy, CGEventType type, CGEv
                                                           CGEventMaskBit(NX_SYSDEFINED),
                                                           tapEventCallback,
                                                           (__bridge void*)self);
-       assert(_eventPort != NULL);
+        
+        if (_eventPort != NULL){
+            _eventPortSource = CFMachPortCreateRunLoopSource(kCFAllocatorSystemDefault, _eventPort, 0);
+            
+            if (_eventPortSource != NULL){
 
-    _eventPortSource = CFMachPortCreateRunLoopSource(kCFAllocatorSystemDefault, _eventPort, 0);
-       assert(_eventPortSource != NULL);
-
-       // Let's do this in a separate thread so that a slow app doesn't lag the event tap
-       [NSThread detachNewThreadSelector:@selector(eventTapThread) toTarget:self withObject:nil];
+                // Let's do this in a separate thread so that a slow app doesn't lag the event tap
+                [NSThread detachNewThreadSelector:@selector(eventTapThread) toTarget:self withObject:nil];
+                
+                return YES;
+            }
+        }
+        
+        [self setShouldInterceptMediaKeyEvents:NO];
+        
+        return NO;
     }
 }
 -(void)stopWatchingMediaKeys;