fix error message

1 files changed, 1 insertions, 1 deletions

diff --git a/emscripten.py b/emscripten.py
index 8bd1b58a..1fc5f190 100755
--- a/emscripten.py
+++ b/emscripten.py
@@ -243,7 +243,7 @@ def emscript(infile, settings, outfile, libraries=[]):
 
   outputs = [output.split('//FORWARDED_DATA:') for output in outputs]
   for output in outputs:
-    assert len(output) == 2, 'Did not receive forwarded data in an output - process failed? We only got: ' + output[1]
+    assert len(output) == 2, 'Did not receive forwarded data in an output - process failed? We only got: ' + output[0]
 
   if DEBUG: print >> sys.stderr, '  emscript: phase 2 took %s seconds' % (time.time() - t)
   if DEBUG: t = time.time()