# \[Bug\] v8.1.12 Error on invoking extension function, NoBlockingWorkAllowedException

**URL:** <https://forum.inductiveautomation.com/t/bug-v8-1-12-error-on-invoking-extension-function-noblockingworkallowedexception/55102>\
**Category:** Module Development\
**Tags:** perspective\
**Created:** [January 18, 2022, 12:30pm UTC](https://forum.inductiveautomation.com/t/bug-v8-1-12-error-on-invoking-extension-function-noblockingworkallowedexception/55102 "2022-01-18T12:30:14Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![victordcq](https://avatars.discourse-cdn.com/v4/letter/v/f6c823/32.png) [@victordcq](https://forum.inductiveautomation.com/u/victordcq)\
**Post date:** [January 18, 2022, 2:59pm UTC](https://forum.inductiveautomation.com/t/bug-v8-1-12-error-on-invoking-extension-function-noblockingworkallowedexception/55102/2 "2022-01-18T14:59:08Z")

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@paul-griffith (calling you since you seem to have been answering my questions to the java side a lot :D)  
So looking in the previous version of the javadocs i see no mention of BlockingWork before 8.1.12 ☹

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