diff --git a/CommonHelpers/Instance.cs b/CommonHelpers/Instance.cs
index 8dab762..efcc111 100644
--- a/CommonHelpers/Instance.cs
+++ b/CommonHelpers/Instance.cs
@@ -105,7 +105,7 @@ namespace CommonHelpers
             }
         }
 
-        public static T WithGlobalMutex<T>(int timeoutMs, Func<T> func)
+        public static T? WithGlobalMutex<T>(int timeoutMs, Func<T?> func)
         {
             var mutex = WaitGlobalMutex(timeoutMs);
             if (mutex is null)
diff --git a/CommonHelpers/RTSS.cs b/CommonHelpers/RTSS.cs
index 94f2b84..a5f27a4 100644
--- a/CommonHelpers/RTSS.cs
+++ b/CommonHelpers/RTSS.cs
@@ -10,12 +10,13 @@ namespace CommonHelpers
             return IsOSDForeground(out _);
         }
 
-        public static bool IsOSDForeground(out int? processId)
+        public static bool IsOSDForeground(out int processId)
         {
             try
             {
-                processId = (int?)GetTopLevelProcessId();
-                if (processId is null)
+                var id = GetTopLevelProcessId();
+                processId = (int)id.GetValueOrDefault(0);
+                if (id is null)
                     return false;
 
                 foreach (var app in OSD.GetAppEntries(AppFlags.MASK))
@@ -28,7 +29,7 @@ namespace CommonHelpers
             }
             catch
             {
-                processId = null;
+                processId = 0;
                 return false;
             }
         }
diff --git a/PowerControl/Menu/MenuItemWithOptions.cs b/PowerControl/Menu/MenuItemWithOptions.cs
index af8256f..2818979 100644
--- a/PowerControl/Menu/MenuItemWithOptions.cs
+++ b/PowerControl/Menu/MenuItemWithOptions.cs
@@ -8,10 +8,10 @@ namespace PowerControl.Menu
         public int ApplyDelay { get; set; }
         public bool CycleOptions { get; set; } = true;
 
-        public Func<object>? CurrentValue { get; set; }
-        public Func<object[]>? OptionsValues { get; set; }
-        public Func<object, object>? ApplyValue { get; set; }
-        public Func<object>? ResetValue { get; set; }
+        public Func<object?>? CurrentValue { get; set; }
+        public Func<object[]?>? OptionsValues { get; set; }
+        public Func<object, object?>? ApplyValue { get; set; }
+        public Func<object?>? ResetValue { get; set; }
 
         private System.Windows.Forms.Timer delayTimer = new System.Windows.Forms.Timer();
         private ToolStripMenuItem toolStripItem = new ToolStripMenuItem();
diff --git a/PowerControl/Options/GPUFrequency.cs b/PowerControl/Options/GPUFrequency.cs
index 7dc5465..df31971 100644
--- a/PowerControl/Options/GPUFrequency.cs
+++ b/PowerControl/Options/GPUFrequency.cs
@@ -34,7 +34,7 @@ namespace PowerControl.Options
                             return selected;
                         }
 
-                        sd.HardMinGfxClock = uint.Parse(selected.ToString().Replace("MHz", ""));
+                        sd.HardMinGfxClock = uint.Parse(selected.ToString()?.Replace("MHz", "") ?? "200");
                         return selected;
                     }
                 });
diff --git a/PowerControl/Options/SMT.cs b/PowerControl/Options/SMT.cs
index 4e24f8b..1808791 100644
--- a/PowerControl/Options/SMT.cs
+++ b/PowerControl/Options/SMT.cs
@@ -18,7 +18,7 @@ namespace PowerControl.Options
                 if (!ProcessorCores.HasSMTThreads())
                     return null;
 
-                return ProcessorCores.IsUsingSMT(processId.Value) ? "Yes" : "No";
+                return ProcessorCores.IsUsingSMT(processId) ? "Yes" : "No";
             },
             ApplyValue = delegate (object selected)
             {
@@ -27,9 +27,9 @@ namespace PowerControl.Options
                 if (!ProcessorCores.HasSMTThreads())
                     return null;
 
-                ProcessorCores.SetProcessSMT(processId.Value, selected.ToString() == "Yes");
+                ProcessorCores.SetProcessSMT(processId, selected.ToString() == "Yes");
 
-                return ProcessorCores.IsUsingSMT(processId.Value) ? "Yes" : "No";
+                return ProcessorCores.IsUsingSMT(processId) ? "Yes" : "No";
             }
         };
     }
diff --git a/PowerControl/Options/TDP.cs b/PowerControl/Options/TDP.cs
index 42647dc..f3ca5f3 100644
--- a/PowerControl/Options/TDP.cs
+++ b/PowerControl/Options/TDP.cs
@@ -21,7 +21,11 @@ namespace PowerControl.Options
                 )
                     return null;
 
-                uint mW = uint.Parse(selected.ToString().Replace("W", "")) * 1000;
+                var selectedText = selected.ToString();
+                if (selectedText is null)
+                    return null;
+
+                uint mW = uint.Parse(selectedText.Replace("W", "")) * 1000;
 
                 if (VangoghGPU.IsSupported)
                 {