- added ISSUE_TEMPLATE.md

- added null reference checks

winPEAS/winPEASexe/winPEAS/Checks/SystemInfo.cs

@@ -139,7 +139,7 @@ namespace winPEAS.Checks
 
                     // get our properties
                     //  ref - https://docs.microsoft.com/en-us/windows/win32/api/wuapi/nn-wuapi-iupdatehistoryentry
-                    var title = searcherObj.GetType().InvokeMember("Title", BindingFlags.GetProperty, null, item, new object[] { }).ToString();
+                    var title = searcherObj.GetType().InvokeMember("Title", BindingFlags.GetProperty, null, item, new object[] { })?.ToString() ?? string.Empty;
                     var date = searcherObj.GetType().InvokeMember("Date", BindingFlags.GetProperty, null, item, new object[] { });
                     var description = searcherObj.GetType().InvokeMember("Description", BindingFlags.GetProperty, null, item, new object[] { });
                     var clientApplicationID = searcherObj.GetType().InvokeMember("ClientApplicationID", BindingFlags.GetProperty, null, item, new object[] { });

winPEAS/winPEASexe/winPEAS/Helpers/AppLocker/AppLockerHelper.cs

@@ -80,12 +80,15 @@ namespace winPEAS.Helpers.AppLocker
 
                 Beaprint.NoColorPrint($"   AppLockerPolicy version: {appLockerSettings.Version}\n   listing rules:\n\n");
 
-                foreach (var rule in appLockerSettings.RuleCollection)
+                if (appLockerSettings.RuleCollection != null)
                 {
-                    PrintFileHashRules(rule);
-                    PrintFilePathRules(rule);
-                    PrintFilePublisherRules(rule);
-                }
+                    foreach (var rule in appLockerSettings.RuleCollection)
+                    {
+                        PrintFileHashRules(rule);
+                        PrintFilePathRules(rule);
+                        PrintFilePublisherRules(rule);
+                    }
+                }                
             }
             catch (COMException)
             {

winPEAS/winPEASexe/winPEAS/Helpers/Registry/RegistryHelper.cs

@@ -143,6 +143,12 @@ namespace winPEAS.Helpers.Registry
                 {
                     myKey = Microsoft.Win32.Registry.CurrentUser.OpenSubKey(path);
                 }
+
+                if (myKey == null)
+                {
+                    return new string[0];
+                }
+
                 String[] subkeyNames = myKey.GetSubKeyNames();
                 return myKey.GetSubKeyNames();
             }

winPEAS/winPEASexe/winPEAS/Info/SystemInfo/SysMon/SysMon.cs

@@ -92,6 +92,12 @@ namespace winPEAS.Info.SystemInfo.SysMon
             try
             {
                 var key = registryKey.OpenSubKey(paramsKey);
+
+                if (key == null)
+                {
+                    return null;
+                }
+
                 byte[] result = (byte[])key.GetValue(val);
 
                 return result;

winPEAS/winPEASexe/winPEAS/Wifi/NativeWifiApi/WlanClient.cs

@@ -90,7 +90,10 @@ namespace winPEAS.Wifi.NativeWifiApi
 
         ~WlanClient()
         {
-            WlanApi.WlanCloseHandle(clientHandle, IntPtr.Zero);
+            if (clientHandle != IntPtr.Zero)
+            {
+                WlanApi.WlanCloseHandle(clientHandle, IntPtr.Zero);
+            }            
         }
             
         /// <summary>