Difference betwen dev and production

I have an gwt 2.7 app that wrap components in a legacy web app.

In super dev mode, every run correcty 

In production, something goes wrong and I get a syntax error in console :

Unexpected token :

Here is the line from the generated  js 

      t[1]?t[0].execute__Z() && (rescheduled = com_google_gwt_core_client_impl_SchedulerImpl_push__Lcom_google_gwt_core_client_JsArray_2Lcom_google_gwt_core_client_impl_SchedulerImpl$Task_2Lcom_google_gwt_core_client_JsArray_2(rescheduled, t)):com_google_gwt_user_client_ui_Image$State: Exp $1_$execute__Lcom_google_gwt_user_client_ui_Image$State: Exp $1_2V(t[0]);

Seems to talk about an image I wrapping but I cannot understand more than that.

Thanks in advance for any help

Pierre

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