Double end of sequence being fired on unsafe condition met

@stellarskies

Thanks for the report... this issue has been fixed in the next beta (2.5.2.2).

Not as odd as it may seem. Sometimes other fixes in other areas have unintended side effects (like this one). Also, in a multi-threaded application, bugs due to timing issues are not that uncommon... sequence works one night and not the next, just because of timing issues microseconds apart.