Check for the extension definition before trying to extend
Check for the extension definition before trying to extend

SvitlanaShepitsena/remax-banner,ildarsamit/framework,jeremykenedy/framework,infamous/famous-framework,Famous/framework,jeremykenedy/framework,KraigWalker/framework,SvitlanaShepitsena/shakou,woltemade/framework,infamous/famous-framework,SvitlanaShepitsena/framework-1,SvitlanaShepitsena/framework-1,SvitlanaShepitsena/remax-banner,tbossert/framework,SvitlanaShepitsena/framework,SvitlanaShepitsena/shakou,colllin/famous-framework,ildarsamit/framework,SvitlanaShepitsena/framework,infamous/framework,Famous/framework,KraigWalker/framework,colllin/famous-framework,woltemade/framework,infamous/framework,tbossert/framework