diff --git a/lib/matplotlib/backends/backend_wx.py b/lib/matplotlib/backends/backend_wx.py
index 514038633637..6f836db94a1f 100644
--- a/lib/matplotlib/backends/backend_wx.py
+++ b/lib/matplotlib/backends/backend_wx.py
@@ -121,7 +121,7 @@ class TimerWx(TimerBase):
'''
def __init__(self, *args, **kwargs):
- if isinstance(args[0], wx.EvtHandler):
+ if args and isinstance(args[0], wx.EvtHandler):
cbook.warn_deprecated(
"3.0", "Passing a wx.EvtHandler as first argument to the "
"TimerWx constructor is deprecated since %(version)s.")
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