diff --git a/SabreHelper/RomManipulation.cs b/SabreHelper/RomManipulation.cs
index 2374a9c5..05a0d21a 100644
--- a/SabreHelper/RomManipulation.cs
+++ b/SabreHelper/RomManipulation.cs
@@ -279,15 +279,24 @@ namespace SabreTools.Helper
 					}
 
 					// Sanitize the hashes from null, hex sizes, and "true blank" strings
-					rom.CRC = (rom.CRC.StartsWith("0x") ? rom.CRC.Remove(0, 2) : rom.CRC);
-					rom.CRC = (rom.CRC == "-" ? "" : rom.CRC);
-					rom.CRC = (rom.CRC == "" ? "" : rom.CRC.PadLeft(8, '0'));
-					rom.MD5 = (rom.MD5.StartsWith("0x") ? rom.MD5.Remove(0, 2) : rom.MD5);
-					rom.MD5 = (rom.MD5 == "-" ? "" : rom.MD5);
-					rom.MD5 = (rom.MD5 == "" ? "" : rom.MD5.PadLeft(32, '0'));
-					rom.SHA1 = (rom.SHA1.StartsWith("0x") ? rom.SHA1.Remove(0, 2) : rom.SHA1);
-					rom.SHA1 = (rom.SHA1 == "-" ? "" : rom.SHA1);
-					rom.SHA1 = (rom.SHA1 == "" ? "" : rom.SHA1.PadLeft(40, '0'));
+					if (rom.CRC != null)
+					{
+						rom.CRC = (rom.CRC.StartsWith("0x") ? rom.CRC.Remove(0, 2) : rom.CRC);
+						rom.CRC = (rom.CRC == "-" ? "" : rom.CRC);
+						rom.CRC = (rom.CRC == "" ? "" : rom.CRC.PadLeft(8, '0'));
+					}
+					if (rom.MD5 != null)
+					{
+						rom.MD5 = (rom.MD5.StartsWith("0x") ? rom.MD5.Remove(0, 2) : rom.MD5);
+						rom.MD5 = (rom.MD5 == "-" ? "" : rom.MD5);
+						rom.MD5 = (rom.MD5 == "" ? "" : rom.MD5.PadLeft(32, '0'));
+					}
+					if (rom.SHA1 != null)
+					{
+						rom.SHA1 = (rom.SHA1.StartsWith("0x") ? rom.SHA1.Remove(0, 2) : rom.SHA1);
+						rom.SHA1 = (rom.SHA1 == "-" ? "" : rom.SHA1);
+						rom.SHA1 = (rom.SHA1 == "" ? "" : rom.SHA1.PadLeft(40, '0'));
+					}
 
 					// If we have a rom and it's missing size AND the hashes match a 0-byte file, fill in the rest of the info
 					if (rom.Type == "rom" && (rom.Size == 0 || rom.Size == -1) && ((rom.CRC == Constants.CRCZero || rom.CRC == "") || rom.MD5 == Constants.MD5Zero || rom.SHA1 == Constants.SHA1Zero))
@@ -554,15 +563,24 @@ namespace SabreTools.Helper
 						};
 
 						// Sanitize the hashes from null, hex sizes, and "true blank" strings
-						rom.CRC = (rom.CRC.StartsWith("0x") ? rom.CRC.Remove(0, 2) : rom.CRC);
-						rom.CRC = (rom.CRC == "-" ? "" : rom.CRC);
-						rom.CRC = (rom.CRC == "" ? "" : rom.CRC.PadLeft(8, '0'));
-						rom.MD5 = (rom.MD5.StartsWith("0x") ? rom.MD5.Remove(0, 2) : rom.MD5);
-						rom.MD5 = (rom.MD5 == "-" ? "" : rom.MD5);
-						rom.MD5 = (rom.MD5 == "" ? "" : rom.MD5.PadLeft(32, '0'));
-						rom.SHA1 = (rom.SHA1.StartsWith("0x") ? rom.SHA1.Remove(0, 2) : rom.SHA1);
-						rom.SHA1 = (rom.SHA1 == "-" ? "" : rom.SHA1);
-						rom.SHA1 = (rom.SHA1 == "" ? "" : rom.SHA1.PadLeft(40, '0'));
+						if (rom.CRC != null)
+						{
+							rom.CRC = (rom.CRC.StartsWith("0x") ? rom.CRC.Remove(0, 2) : rom.CRC);
+							rom.CRC = (rom.CRC == "-" ? "" : rom.CRC);
+							rom.CRC = (rom.CRC == "" ? "" : rom.CRC.PadLeft(8, '0'));
+						}
+						if (rom.MD5 != null)
+						{
+							rom.MD5 = (rom.MD5.StartsWith("0x") ? rom.MD5.Remove(0, 2) : rom.MD5);
+							rom.MD5 = (rom.MD5 == "-" ? "" : rom.MD5);
+							rom.MD5 = (rom.MD5 == "" ? "" : rom.MD5.PadLeft(32, '0'));
+						}
+						if (rom.SHA1 != null)
+						{
+							rom.SHA1 = (rom.SHA1.StartsWith("0x") ? rom.SHA1.Remove(0, 2) : rom.SHA1);
+							rom.SHA1 = (rom.SHA1 == "-" ? "" : rom.SHA1);
+							rom.SHA1 = (rom.SHA1 == "" ? "" : rom.SHA1.PadLeft(40, '0'));
+						}
 
 						// If we have a rom and it's missing size AND the hashes match a 0-byte file, fill in the rest of the info
 						if (rom.Type == "rom" && (rom.Size == 0 || rom.Size == -1) && ((rom.CRC == Constants.CRCZero || rom.CRC == "") || rom.MD5 == Constants.MD5Zero || rom.SHA1 == Constants.SHA1Zero))