Index: src/OFMethodSignature.m
==================================================================
--- src/OFMethodSignature.m
+++ src/OFMethodSignature.m
@@ -47,10 +47,13 @@
 
 		(*type)++;
 		(*length)--;
 	}
 
+	if (count == 0)
+		@throw [OFInvalidFormatException exception];
+
 	size = sizeofEncoding(type, length);
 
 	if (*length == 0 || **type != ']')
 		@throw [OFInvalidFormatException exception];