Emacs undo binding on OS X

Every time I hit ctrl-/ to undo, the default key binding for undo in the Emacs keymaps that come with PyCharm, the undo happens but I also get a system beep.  This beep doesn't happen if I use ctrl-underscore, the other default binding, or if I select undo from the "Edit" menu.

Why is PyCharm beeping whenever I undo with C-/?  How can I stop it from beeping?

PyCharm 3.4
Mac OS X 10.9.5
Apple JRE 1.6.0

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Still seeing same problem.  Any help?  How can I stop the beeping?  Thanks!


PyCharm 5.0.3 (build #PY-143.1559, December 22, 2015)

OS X 10.11.3

JRE: 1.8.0_40-release-b108 x86_64

JVM: OpenJDK 64-Bit Server VM by JetBrain s.r.o


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