IMEI #null

I m using samsung GtS5302, I tried to customize my phone by flashing it to CM9. But process strucked in between, luckily i have a backup of my original rom which i restored but i have lost my imei in all this process, an error (IMEI null) is shown to me when i checked my imei :( ..how can i recover that... I believe that my problem will be solved by experts :angel: .......please help me.....

Thank you!!! :o

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