fix: ignore zombie processes

src/api-wrappers/HelperExtensions.swift

@@ -1,4 +1,5 @@
 import Cocoa
+import Darwin
 
 extension Collection {
     // recursive flatMap
@@ -172,3 +173,16 @@ extension NSImage {
         return dimmed
     }
 }
+
+extension pid_t {
+    func isZombie() -> Bool {
+        var kinfo = kinfo_proc()
+        var size = MemoryLayout<kinfo_proc>.stride
+        var mib: [Int32] = [CTL_KERN, KERN_PROC, KERN_PROC_PID, self]
+        sysctl(&mib, u_int(mib.count), &kinfo, &size, nil, 0)
+        let command = withUnsafePointer(to: &kinfo.kp_proc.p_comm) {
+            String(cString: UnsafeRawPointer($0).assumingMemoryBound(to: CChar.self))
+        }
+        return kinfo.kp_proc.p_stat == SZOMB
+    }
+}

src/logic/Applications.swift

@@ -92,7 +92,7 @@ class Applications {
     }
 
     private static func isActualApplication(_ app: NSRunningApplication) -> Bool {
-        return app.activationPolicy != .prohibited || isNotXpc(app)
+        return (app.activationPolicy != .prohibited || isNotXpc(app)) && !app.processIdentifier.isZombie()
     }
 
     private static func isNotXpc(_ app: NSRunningApplication) -> Bool {