Fix nil pointer dereference for cron #319
Merged
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This fixes #220 and fixes #242.
I did not encounter this myself, but based on the error call stack provided, the error seems to be due to a nil logger being passed to
cron.SkipIfStillRunning
.If the next update occurs before the current update finishes, the nil logger is used without check and triggers the nil pointer dereference error.