A crack occurred near the saddle all the way to the hollow space. 

Is it okay to put on strings after this crack? 

Please advise. 

I think he means bridge to soundhole, the bridge may be pulling up from over tuning, by all means do not string it, get it fixed.
Depends on the crack.  None of us can give a good answer unless we know exactly where the crack is and how big it is.  A picture would help.
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