Fix "Cannot read properties of null (reading 'callback')" error occured in Doc.prototype._handleSubscribe#613
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jiazheng wants to merge 1 commit intoshare:masterfrom
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Fix "Cannot read properties of null (reading 'callback')" error occured in Doc.prototype._handleSubscribe#613jiazheng wants to merge 1 commit intoshare:masterfrom
jiazheng wants to merge 1 commit intoshare:masterfrom
