diff -r b8b47f9b5e56 -r 396da88d7b5c graphics/GraphicCommons.py
--- a/graphics/GraphicCommons.py	Fri Sep 22 10:57:57 2017 +0300
+++ b/graphics/GraphicCommons.py	Fri Sep 22 16:37:38 2017 +0300
@@ -2652,7 +2652,7 @@
         scalex, scaley = dc.GetUserScale()
         dc.SetUserScale(1, 1)
         # If user trying to connect wire with wrong input, highlight will become red.
-        if self.ErrHighlight and not (self.EndConnected):
+        if self.ErrHighlight and not self.EndConnected:
             highlightcolor = wx.RED
         else:
             highlightcolor = HIGHLIGHTCOLOR