diff --git a/Tokenizer.cs b/Tokenizer.cs
index 3bf618a..edc0169 100644
--- a/Tokenizer.cs
+++ b/Tokenizer.cs
@@ -958,6 +958,10 @@ class Tokenizer
 					AppendDataIntHex(ch);
 					state = State.HexNumber;
 				}
+				else if(ch == '.')
+				{
+					throw new NotImplementedException($"{currentLocation}: Hex floats at are not implemented");
+				}
 				else
 				{
 					if(currentToken == null || currentToken.type == null)
@@ -986,6 +990,10 @@ class Tokenizer
 					currentToken!.type = TokenType.Numeral;
 					AppendDataIntHex(ch);
 				}
+				else if(ch == '.')
+				{
+					throw new NotImplementedException($"{currentLocation}: Hex floats at are not implemented");
+				}
 				else
 				{
 					if(currentToken == null || currentToken.type == null)