Fixed a bug that panic occurs when the value is null
Fixed a bug that panic occurs when the value is null

arthurpro/gorm,trigrass2/gorm,otiai10/gorm,xaionaro/gorm,sunfmin/gorm,ivpusic/gorm,sulnedinfind/gorm,xinhuang327/gorm,aspcartman/gorm,sdhjl2000/gorm,ivpusic/gorm,sidorenko-ruslan/gorm,lscieux/gorm,senseobservationsystems/gorm,kiwih/gorm,javierprovecho/gorm,KevinSjoberg/gorm,unravelin/gorm,awakenetworks/gorm,Acidburn0zzz/gorm,sdhjl2000/gorm,Twister915/gorm,gernest/ngorm,embroker/gorm,Twister915/gorm,kimiby/gorm,armiller/gorm,otiai10/gorm,liudanking/gorm,wallclockbuilder/gorm,yibin001/gorm,Acidburn0zzz/gorm,ModelRocket/gorm,kimiby/gorm,sidorenko-ruslan/gorm,pariz/gorm,xaionaro/gorm,NOX73/gorm,KevinSjoberg/gorm,ilgooz/gorm,trigrass2/gorm,jmptrader/gorm,OscaRoa/gorm,unravelin/gorm,ulule/gorm,jaytaylor/gorm,NOX73/gorm,nkovacs/gorm,xinhuang327/gorm,seatgeek/gorm,andviro/gorm,jinzhu/gorm,acdgfh/gorm,arthurpro/gorm,bpizzi/gorm,OscaRoa/gorm,d4l3k/gorm,jinzhu/gorm,d4l3k/gorm,pariz/gorm,sulnedinfind/gorm,javierprovecho/gorm,lscieux/gorm,kiwih/gorm,liudanking/gorm,postmates/gorm,jmptrader/gorm,embroker/gorm,nkovacs/gorm,ulule/gorm,seatgeek/gorm,postmates/gorm,acdgfh/gorm,armiller/gorm,aperera/gorm,andviro/gorm,ch3lo/gorm,jaytaylor/gorm,sunfmin/gorm,ch3lo/gorm,ngorm/ngorm,senseobservationsystems/gorm,aspcartman/gorm,wallclockbuilder/gorm,yibin001/gorm,ModelRocket/gorm,bpizzi/gorm,ilgooz/gorm,awakenetworks/gorm,aperera/gorm