# MQTT invalid tag at path **URL:** \ **Category:** Ignition\ **Tags:** ignition81\ **Created:** [April 24, 2023, 2:29pm UTC](https://forum.inductiveautomation.com/t/mqtt-invalid-tag-at-path/72823 "2023-04-24T14:29:41Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![plcmercenary](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/plcmercenary/32/39711_2.png) [@plcmercenary](https://forum.inductiveautomation.com/u/plcmercenary)\ **Post date:** [April 24, 2023, 2:29pm UTC](https://forum.inductiveautomation.com/t/mqtt-invalid-tag-at-path/72823/1 "2023-04-24T14:29:42Z")
Hello all. I am using 8.1.26, engine module 4.0.16. Tags are added to MQTT Engine folders with no problem I can stop the engine, set a custom namespace root folder. and all tags add without any issues Data source is sending MQTT updates every 10 seconds, every tag every read after the initial tag build throws error "invalid tag at path 'mqtt/scadaBytes/East-Brazos/tankX/Level' - unable to handle payload on custom namespace topic=scadaBytes/East-Brazos/tankX/Level" for every tag. this is the only info in the logs, there is no traceback additional info. I do not have a string converter configured in the engine. ![CleanShot 2023-04-24 at 09.26.35](https://us1.discourse-cdn.com/inductiveautomation/original/3X/7/3/7385ecc2096937068d2e1b6988c852273fbff2b6.png) ![CleanShot 2023-04-24 at 09.27.15](https://us1.discourse-cdn.com/inductiveautomation/original/3X/f/c/fc7837f563736c3de865b477af78e4d7e28a7214.png) ![CleanShot 2023-04-24 at 09.28.35](https://us1.discourse-cdn.com/inductiveautomation/original/3X/b/d/bd5b54c930dc6973a61f04aeb0be857a3896b660.png) ---
**Author:** ![Ethan\_Roth](https://avatars.discourse-cdn.com/v4/letter/e/6de8d8/32.png) [@Ethan\_Roth](https://forum.inductiveautomation.com/u/Ethan_Roth)\ **Post date:** [April 30, 2023, 3:07am UTC](https://forum.inductiveautomation.com/t/mqtt-invalid-tag-at-path/72823/2 "2023-04-30T03:07:02Z")
I am having the same issue, any luck? ---
**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\ **Post date:** [April 30, 2023, 12:02pm UTC](https://forum.inductiveautomation.com/t/mqtt-invalid-tag-at-path/72823/3 "2023-04-30T12:02:43Z")
Y'all might have better luck posting directly on Cirrus Link's forum: > **[Cirrus Link Forum](https://forum.cirrus-link.com/)** > > A place to discuss software from Cirrus Link Solutions ---
**Author:** ![Lusky](https://avatars.discourse-cdn.com/v4/letter/l/b4bc9f/32.png) [@Lusky](https://forum.inductiveautomation.com/u/Lusky)\ **Post date:** [May 7, 2023, 2:39pm UTC](https://forum.inductiveautomation.com/t/mqtt-invalid-tag-at-path/72823/4 "2023-05-07T14:39:24Z")
Same issue for me... will search for you on CirrusLInk as well. ---
**Author:** ![caall](https://avatars.discourse-cdn.com/v4/letter/c/ce7236/32.png) [@caall](https://forum.inductiveautomation.com/u/caall)\ **Post date:** [May 8, 2023, 8:38pm UTC](https://forum.inductiveautomation.com/t/mqtt-invalid-tag-at-path/72823/5 "2023-05-08T20:38:43Z")
Similar issue: Ignition Maker (8.1.27), MQTT Distributor/Engine/Transmission (4.0.16) Publishing to a topic for the first time creates the tag as expected, but publishing to it again gets the log message "Invalid tag at path '' - unable to handle payload on custom namespace topic=". Value changes on the subsequent publish are reflected in the MQTT broker, but not the Ignition tag. ---
**Author:** ![justinedwards.jle](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/justinedwards.jle/32/37854_2.png) [@justinedwards.jle](https://forum.inductiveautomation.com/u/justinedwards.jle)\ **Post date:** [May 8, 2023, 9:01pm UTC](https://forum.inductiveautomation.com/t/mqtt-invalid-tag-at-path/72823/6 "2023-05-08T21:01:27Z")
Perhaps start a new topic at Cirrus Link, since it doesn't look like this question has been asked there before: [Cirrus Link, New Topic = "Invalid Tag at Path"](https://forum.cirrus-link.com/new-topic?title=Invalid%20tag%20at%20Path) ---
**Author:** ![caall](https://avatars.discourse-cdn.com/v4/letter/c/ce7236/32.png) [@caall](https://forum.inductiveautomation.com/u/caall)\ **Post date:** [May 8, 2023, 10:44pm UTC](https://forum.inductiveautomation.com/t/mqtt-invalid-tag-at-path/72823/7 "2023-05-08T22:44:18Z")
Started topic in Cirrus Link forum: [Getting StringPayloadHandler error "Invalid tag at Path" on subsequent tag publish](https://forum.cirrus-link.com/t/getting-stringpayloadhandler-error-invalid-tag-at-path-on-subsequent-tag-publish/364?u=caall) ---
**Author:** ![justinedwards.jle](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/justinedwards.jle/32/37854_2.png) [@justinedwards.jle](https://forum.inductiveautomation.com/u/justinedwards.jle)\ **Post date:** [May 9, 2023, 12:07am UTC](https://forum.inductiveautomation.com/t/mqtt-invalid-tag-at-path/72823/8 "2023-05-09T00:07:10Z")
Looks like they've already replied with the solution: > **[Getting StringPayloadHandler error "Invalid tag at Path" on subsequent tag...](https://forum.cirrus-link.com/t/getting-stringpayloadhandler-error-invalid-tag-at-path-on-subsequent-tag-publish/364/2?u=justinedwards.jle)** > > This looks to be a known issue related to non JSON payloads that we have a fix for in our nightly build available here https://docs.chariot.io/display/CLD80/Nightly+Module+Builds. ---
**Author:** ![caall](https://avatars.discourse-cdn.com/v4/letter/c/ce7236/32.png) [@caall](https://forum.inductiveautomation.com/u/caall)\ **Post date:** [May 9, 2023, 1:59am UTC](https://forum.inductiveautomation.com/t/mqtt-invalid-tag-at-path/72823/9 "2023-05-09T01:59:24Z")
Confirmed, updating MQTT Engine to nightly build (I used 4.0.17-SNAPSHOT (b2023050816)) resolves the issue