1 files changed, 1 insertions, 0 deletions
diff --git a/tools/pxlasm.py b/tools/pxlasm.py
index 38bd7256d..6869eb909 100755
--- a/tools/pxlasm.py
+++ b/tools/pxlasm.py
@@ -608,6 +608,7 @@ class pxl_asm:
             return 1
         else:
             print >> sys.stderr, "Unlisted attribute tag:", tag
+            raise(SyntaxError), "Unlisted attribute tag found in PXL disassembly"
         return 0
 
     def Tag_attr_uint16(self):