diff -r fb73a6b6622d -r 4d81c3bcac82 svgui/pyjs/lib/sys.py
--- a/svgui/pyjs/lib/sys.py	Thu Oct 19 11:03:03 2017 +0300
+++ b/svgui/pyjs/lib/sys.py	Thu Oct 19 13:33:01 2017 +0300
@@ -2,7 +2,7 @@
 platform = ''  # to be updated by app, on compile
 
 # a dictionary of module override names (platform-specific)
-overrides = None  # to be updated by app, on compile
+overrides = {}  # to be updated by app, on compile
 
 # the remote path for loading modules
 loadpath = None