diff --git a/CodeLegacy/Os/OsUtils.cs b/CodeLegacy/Os/OsUtils.cs
index 5090a49..dd93768 100644
--- a/CodeLegacy/Os/OsUtils.cs
+++ b/CodeLegacy/Os/OsUtils.cs
@@ -333,5 +333,19 @@ namespace Flowframes.Os
 
             return string.Join(";", newPaths.Select(x => x.Replace("\\", "/"))) + ";";
         }
+
+        public static bool IsStillRunning(Func<Process> proc) // For .NET Core migration: Func<Process?> (nullable)
+        {
+            var p = proc(); // Snapshot of the process to avoid race condition
+
+            try
+            {
+                return p is null || !p.HasExited;
+            }
+            catch
+            {
+                return false;
+            }
+        }
     }
 }
\ No newline at end of file
diff --git a/CodeLegacy/Program.cs b/CodeLegacy/Program.cs
index f686538..42b851d 100644
--- a/CodeLegacy/Program.cs
+++ b/CodeLegacy/Program.cs
@@ -182,7 +182,7 @@ namespace Flowframes
 
                     // Logger.Log($"Disk space check for '{drivePath}/': {spaceGb} GB free, next check in {nextWaitTimeMs / 1024} sec", true);
 
-                    if (!Interpolate.canceled && (AiProcess.lastAiProcess != null && !AiProcess.lastAiProcess.HasExited) && lowDiskSpace)
+                    if (!Interpolate.canceled && OsUtils.IsStillRunning(() => AiProcess.lastAiProcess) && lowDiskSpace)
                     {
                         if (tooLowDiskSpace)
                         {