Preloadjs V1.0.0 - this.getResult() is null - Firefox only

[DDA12]

I upgraded a project to version 1.0.0 of Preloadjs.
While loading multiple spritesheets, I get: this.getResult() is null (preloadjs.js line 7710) on Firefox only (version 56.0.1). Chrome, Safari and IE work fine.
If you have a solution, I would appreciate it.

Thank you for your help.

[wdamien]

@DDA12 Can you provide some more details on how to reproduce this? A small sample demo would really help us track down whats going on here.

Thanks!