# Memory Tag In UDT, Initial Value

**URL:** <https://forum.inductiveautomation.com/t/memory-tag-in-udt-initial-value/14706>\
**Category:** Ignition\
**Tags:** ignition79\
**Created:** [July 6, 2017, 7:52pm UTC](https://forum.inductiveautomation.com/t/memory-tag-in-udt-initial-value/14706 "2017-07-06T19:52:42Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![dtompkins](https://avatars.discourse-cdn.com/v4/letter/d/a6a055/32.png) [@dtompkins](https://forum.inductiveautomation.com/u/dtompkins)\
**Post date:** [July 6, 2017, 7:52pm UTC](https://forum.inductiveautomation.com/t/memory-tag-in-udt-initial-value/14706/1 "2017-07-06T19:52:42Z")

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Why does my memory tag have an initial value of NULL instead of the default value I specified in its definition. (Presumably that is its default initial value). This is cascading into other expression failures. Any thoughts on this??

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**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\
**Post date:** [July 6, 2017, 8:54pm UTC](https://forum.inductiveautomation.com/t/memory-tag-in-udt-initial-value/14706/2 "2017-07-06T20:54:48Z")

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This is a known issue with UDTs, which hasn’t yet been fixed. For expressions, you should be able to catch invalid values with the `try()` function.

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**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\
**Post date:** [July 7, 2017, 6:00am UTC](https://forum.inductiveautomation.com/t/memory-tag-in-udt-initial-value/14706/3 "2017-07-07T06:00:34Z")

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“Should be able to”, but unfortunately may not due to a bug with the try() function still producing errors… fix will be in 7.9.5 I’m told.