Cannot read property 'offsetWidth' of null

[PranavBhatia]

<div style="width: 100%; height: 100%; margin: 0 auto;">
  <span
         fittext
        *ngIf="SOME_CONDITION"  
  </span>
</div>

Following error:

ERROR TypeError: Cannot read property 'offsetWidth' of null  
    at AngularFittextDirective.calculateNewFontSize (angular-fittext.js:41)  
    at AngularFittextDirective.<anonymous> (angular-fittext.js:35)
    at ZoneDelegate.invokeTask (zone-evergreen.js:399)
    at Object.onInvokeTask (core.js:41709)
    at ZoneDelegate.invokeTask (zone-evergreen.js:398)
    at Zone.runTask (zone-evergreen.js:167)
    at invokeTask (zone-evergreen.js:480)
    at ZoneTask.invoke (zone-evergreen.js:469)
    at timer (zone-evergreen.js:2552)