fix(scroll): prevent 'cannot read from undefined' exception
fix(scroll): prevent 'cannot read from undefined' exception

leobetosouza/ionic,open-anesthesia/ionic,rreinold/FitnessDashboard_IonicApp,MarcBT/ionic,MartinMa/ionic,janij/ionic,MarcBT/ionic,janglednerves/ionic,thompsonemerson/ionic,KholofeloMoyaba/atajo-ui,janglednerves/ionic,KholofeloMoyaba/atajo-ui,open-anesthesia/ionic,thompsonemerson/ionic,JoeyAndres/meteoric-sass,sloops77/ionic,janglednerves/ionic,janglednerves/ionic,rreinold/FitnessDashboard_IonicApp,sloops77/ionic,GhostGroup/ionic,open-anesthesia/ionic,jgw96/ionic,envistaInteractive/ionic,GhostGroup/ionic,GhostGroup/ionic,janij/ionic,jgw96/ionic,open-anesthesia/ionic,5amfung/ionic,MartinMa/ionic,VinceOPS/ionic,anongtech/ionic,jgw96/ionic,5amfung/ionic,thompsonemerson/ionic,MartinMa/ionic,anongtech/ionic,ralic/ionic,VinceOPS/ionic,jgw96/ionic,yanzhihong23/ionic-nono,MarcBT/ionic,envistaInteractive/ionic,yanzhihong23/ionic-nono,jgw96/ionic,5amfung/ionic,janglednerves/ionic,5amfung/ionic,sloops77/ionic,yanzhihong23/ionic-nono,ralic/ionic,yanzhihong23/ionic-nono,janij/ionic,leobetosouza/ionic,thompsonemerson/ionic,KholofeloMoyaba/atajo-ui,VinceOPS/ionic,MartinMa/ionic,envistaInteractive/ionic,leobetosouza/ionic,ralic/ionic,rreinold/FitnessDashboard_IonicApp,ralic/ionic,sloops77/ionic,janij/ionic,KholofeloMoyaba/atajo-ui,GhostGroup/ionic,envistaInteractive/ionic,leobetosouza/ionic,anongtech/ionic,anongtech/ionic,VinceOPS/ionic,rreinold/FitnessDashboard_IonicApp,MarcBT/ionic