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[GH-ISSUE #1399] ESP32 "Guru Meditation Error" after inserting "#include <WiFiManager.h>" into sketch #1198

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opened 2026-02-28 01:28:58 +03:00 by kerem · 6 comments
kerem commented 2026-02-28 01:28:58 +03:00
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Originally created by @jkrasinger on GitHub (Apr 23, 2022).
Original GitHub issue: https://github.com/tzapu/WiFiManager/issues/1399

Basic Infos

Hardware

WiFimanager Branch/Release: 2.0.11-beta

Esp32:

Hardware: ESP32 DEV KIT V1

Core Version: ESP32 2.0.2

Description

After adding "#include <WiFiManager.h>" to sketch without any other modifications to the Program get
"Guru Meditation Error: Core 1 panic'ed (LoadProhibited). Exception was unhandled."

This error seems to happen in the NTPClient routines.

"

Settings in IDE

Module: DOIT ESP32 DEVKIT V1

Additional libraries: TFT, TFT_eSPI, NTPClient, PubSubClient, WiFiUdp

Sketch

Debug Messages

messages here
.....Attempting MQTT connection...MQTT connected
Guru Meditation Error: Core  1 panic'ed (LoadProhibited). Exception was unhandled.

Core  1 register dump:
PC      : 0x400d7177  PS      : 0x00060430  A0      : 0x800d8575  A1      : 0x3ffb2750  
A2      : 0x00000000  A3      : 0x00000000  A4      : 0x00000000  A5      : 0x00000000  
A6      : 0x00000000  A7      : 0x00000000  A8      : 0x800de964  A9      : 0x3ffb2760  
A10     : 0x3ffb27cc  A11     : 0x00000000  A12     : 0x00000001  A13     : 0x3ffc337c  
A14     : 0x3ffc39a4  A15     : 0x3ffb2774  SAR     : 0x0000000a  EXCCAUSE: 0x0000001c  
EXCVADDR: 0x00000000  LBEG    : 0x4008974d  LEND    : 0x4008975d  LCOUNT  : 0xffffffff  


Backtrace:0x400d7174:0x3ffb27500x400d8572:0x3ffb2790 0x400d32af:0x3ffb27c0 0x400d365a:0x3ffb2800 0x400df03d:0x3ffb2820
Originally created by @jkrasinger on GitHub (Apr 23, 2022). Original GitHub issue: https://github.com/tzapu/WiFiManager/issues/1399 ### Basic Infos #### Hardware WiFimanager Branch/Release: 2.0.11-beta Esp32: Hardware: ESP32 DEV KIT V1 Core Version: ESP32 2.0.2 ### Description After adding "#include <WiFiManager.h>" to sketch without any other modifications to the Program get "Guru Meditation Error: Core 1 panic'ed (LoadProhibited). Exception was unhandled." This error seems to happen in the NTPClient routines. " ### Settings in IDE Module: DOIT ESP32 DEVKIT V1 Additional libraries: TFT, TFT_eSPI, NTPClient, PubSubClient, WiFiUdp ### Sketch ### Debug Messages ``` messages here .....Attempting MQTT connection...MQTT connected Guru Meditation Error: Core 1 panic'ed (LoadProhibited). Exception was unhandled. Core 1 register dump: PC : 0x400d7177 PS : 0x00060430 A0 : 0x800d8575 A1 : 0x3ffb2750 A2 : 0x00000000 A3 : 0x00000000 A4 : 0x00000000 A5 : 0x00000000 A6 : 0x00000000 A7 : 0x00000000 A8 : 0x800de964 A9 : 0x3ffb2760 A10 : 0x3ffb27cc A11 : 0x00000000 A12 : 0x00000001 A13 : 0x3ffc337c A14 : 0x3ffc39a4 A15 : 0x3ffb2774 SAR : 0x0000000a EXCCAUSE: 0x0000001c EXCVADDR: 0x00000000 LBEG : 0x4008974d LEND : 0x4008975d LCOUNT : 0xffffffff Backtrace:0x400d7174:0x3ffb27500x400d8572:0x3ffb2790 0x400d32af:0x3ffb27c0 0x400d365a:0x3ffb2800 0x400df03d:0x3ffb2820
kerem 2026-02-28 01:28:58 +03:00
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kerem commented 2026-02-28 01:28:59 +03:00
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@tablatronix commented on GitHub (Apr 23, 2022):

I need a sketch or example

<!-- gh-comment-id:1107511421 --> @tablatronix commented on GitHub (Apr 23, 2022): I need a sketch or example
kerem commented 2026-02-28 01:28:59 +03:00
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@jkrasinger commented on GitHub (Apr 23, 2022):

I understand, but the sketch is a big one, should i really add it to the bug report?

<!-- gh-comment-id:1107512668 --> @jkrasinger commented on GitHub (Apr 23, 2022): I understand, but the sketch is a big one, should i really add it to the bug report?
kerem commented 2026-02-28 01:28:59 +03:00
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@tablatronix commented on GitHub (Apr 23, 2022):

No you should use a miminal reproduction sketch, like an example from the library. ntpclient you say?

<!-- gh-comment-id:1107515010 --> @tablatronix commented on GitHub (Apr 23, 2022): No you should use a miminal reproduction sketch, like an example from the library. ntpclient you say?
kerem commented 2026-02-28 01:28:59 +03:00
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@jkrasinger commented on GitHub (Apr 24, 2022):

Excuse me for the late response, but i tried to reproduce the error with a minimalistic sketch, but i was not able to reproduce it. I first assumed the problem within the WiFi routines, but this was not the case, they worked as expected. The next component to check was the TFT-Touch screen with the libraries TFT, TFT_eSPI in use. I deactivated the code step by step until i reached the "check for a touch" on the screen. As soon as i disabled this routine all was working as expected. So i made a deeper dive in this routine ... and found the bug in my code. I made a loop over 15(???) touch buttons instead of three. I have no idea why this happened. After correcting this little mistake the sketch was up and running again.
This sketch was working even with this error, but by only inserting the "#include <WiFiManager.h>" without using the WiFiManager(!) my sketch died. This is very interesting.

Excuse me for the false alarm, i will close this issue shortly.
Thank you for your quick response.

<!-- gh-comment-id:1107833989 --> @jkrasinger commented on GitHub (Apr 24, 2022): Excuse me for the late response, but i tried to reproduce the error with a minimalistic sketch, but i was not able to reproduce it. I first assumed the problem within the WiFi routines, but this was not the case, they worked as expected. The next component to check was the TFT-Touch screen with the libraries TFT, TFT_eSPI in use. I deactivated the code step by step until i reached the "check for a touch" on the screen. As soon as i disabled this routine all was working as expected. So i made a deeper dive in this routine ... and found the bug in my code. I made a loop over 15(???) touch buttons instead of three. I have no idea why this happened. After correcting this little mistake the sketch was up and running again. This sketch was working even with this error, but by only inserting the "#include <WiFiManager.h>" without using the WiFiManager(!) my sketch died. This is very interesting. Excuse me for the false alarm, i will close this issue shortly. Thank you for your quick response.
kerem commented 2026-02-28 01:28:59 +03:00
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@jkrasinger commented on GitHub (Apr 24, 2022):

I just finished the full implementation of WiFiManager in my sketch and it works perfectly. Thanks you for the library and your intervention. Regards Jonny

<!-- gh-comment-id:1107848738 --> @jkrasinger commented on GitHub (Apr 24, 2022): I just finished the full implementation of WiFiManager in my sketch and it works perfectly. Thanks you for the library and your intervention. Regards Jonny
kerem commented 2026-02-28 01:28:59 +03:00
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@tablatronix commented on GitHub (Apr 24, 2022):

These errors are usually a memory issue accessing a bad pointeror something went out of scope

<!-- gh-comment-id:1107923004 --> @tablatronix commented on GitHub (Apr 24, 2022): These errors are usually a memory issue accessing a bad pointeror something went out of scope
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