diff --git a/BizHawk.Common/Sprintf.cs b/BizHawk.Common/Sprintf.cs
index faa3ef4699..010e3635fe 100644
--- a/BizHawk.Common/Sprintf.cs
+++ b/BizHawk.Common/Sprintf.cs
@@ -442,7 +442,9 @@ namespace BizHawk.Common
 					#region s - string
 					case 's':   // string
 						string t = "{0" + ( fieldLength != int.MinValue ? "," + ( flagLeft2Right ? "-" : String.Empty ) + fieldLength.ToString() : String.Empty ) + ":s}";
-						w = Marshal.PtrToStringAnsi(n);
+						if (n == IntPtr.Zero)
+							w = "(null)";
+						else w = Marshal.PtrToStringAnsi(n);
 						if ( fieldPrecision >= 0 )
 							w = w.Substring( 0, fieldPrecision );