Index: src/uk/me/parabola/mkgmap/main/TypSaver.java
===================================================================
--- src/uk/me/parabola/mkgmap/main/TypSaver.java	(revision 4636)
+++ src/uk/me/parabola/mkgmap/main/TypSaver.java	(working copy)
@@ -42,6 +42,8 @@
 		try (FileInputStream in = new FileInputStream(filename)) {
 			byte[] buf = new byte[256];
 			int n = in.read(buf);
+			if (n == -1)
+				throw new ExitException("TYP file is empty: " + filename);
 
 			ByteBuffer buffer = ByteBuffer.wrap(buf);
 			buffer.order(ByteOrder.LITTLE_ENDIAN);