Index: awt/src/main/java/common/java/awt/AWTEvent.java =================================================================== --- awt/src/main/java/common/java/awt/AWTEvent.java (revision 485572) +++ awt/src/main/java/common/java/awt/AWTEvent.java (working copy) @@ -292,7 +292,8 @@ } long getEventMask(AWTEvent event) { - return getEventDescriptor(event).eventMask; + final EventDescriptor ed = getEventDescriptor(event); + return ed == null ? -1 : ed.eventMask; } }