[xmonad] Issue 448 in xmonad: Applications crash with message 'BadAlloc (insufficient resources for operation)' in specific workspace

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Comment #2 on issue 448 by damian.o... at gmail.com: Applications crash with  
message 'BadAlloc (insufficient resources for operation)' in specific  
workspace
http://code.google.com/p/xmonad/issues/detail?id=448

I found out the error. I used a 0.5 increment ratio:
      normal = (Tall 1 (50/100) (1/2))
Instead of 3/100.

If I change my config file replacing the above line to
      normal = (Tall 1 (3/100) (1/2))
then the crash does not occur.

Now my question is, can this be prevented, even if a silly user like me  
enters these values in the configuration?