Unexpected Shiny crash

shiny
, ,
1

Hello,

I am encountering a strange error since yesterday. I try to "Run App" via RStudio and get the following error:
Warnung: Error in has_one: key must be not be "" or NA
Error in has_one(keys) : key must be not be "" or NA

I have no idea where to start, I've already installed latest R version 4.5.1 and installed all needed libraries, no success. Previous installed version 4.4.1 was doing fine until yesterday.
This happens only in a "big" application, running a small sample application does not show this kind of problem.

Maybe it's helpful, here is the sessioninfo:
R version 4.5.1 (2025-06-13 ucrt)
Platform: x86_64-w64-mingw32/x64
Running under: Windows 11 x64 (build 26100)

Matrix products: default
LAPACK version 3.12.1

locale:
[1] LC_COLLATE=German_Germany.utf8 LC_CTYPE=German_Germany.utf8 LC_MONETARY=German_Germany.utf8 LC_NUMERIC=C
[5] LC_TIME=German_Germany.utf8

time zone: Europe/Berlin
tzcode source: internal

attached base packages:
[1] stats graphics grDevices utils datasets methods base

other attached packages:
[1] plotly_4.11.0 rlang_1.1.6 forcats_1.0.0 shinyWidgets_0.9.0 tidyr_1.3.1 lubridate_1.9.4 DT_0.34.0
[8] knitr_1.50 kableExtra_1.4.0 data.table_1.17.8 gridExtra_2.3 qcc_2.7 shinysky_0.1.3 stringr_1.5.1
[15] ggplot2_3.5.2 dplyr_1.1.4 shinyFiles_0.9.3 shiny_1.11.1

loaded via a namespace (and not attached):
[1] gtable_0.3.6 bslib_0.9.0 xfun_0.52 htmlwidgets_1.6.4 devtools_2.4.5 remotes_2.5.0 processx_3.8.6
[8] callr_3.7.6 crosstalk_1.2.2 vctrs_0.6.5 tools_4.5.1 ps_1.9.1 generics_0.1.4 curl_7.0.0
[15] tibble_3.3.0 pkgconfig_2.0.3 RColorBrewer_1.1-3 desc_1.4.3 lifecycle_1.0.4 compiler_4.5.1 farver_2.1.2
[22] textshaping_1.0.2 fontawesome_0.5.3 httpuv_1.6.16 sass_0.4.10 htmltools_0.5.8.1 usethis_3.2.0 yaml_2.3.10
[29] lazyeval_0.2.2 jquerylib_0.1.4 later_1.4.4 pillar_1.11.0 urlchecker_1.0.1 MASS_7.3-65 ellipsis_0.3.2
[36] cachem_1.1.0 sessioninfo_1.2.3 mime_0.13 tidyselect_1.2.1 digest_0.6.37 stringi_1.8.7 purrr_1.1.0
[43] RJSONIO_2.0.0 fastmap_1.2.0 grid_4.5.1 cli_3.6.5 magrittr_2.0.3 pkgbuild_1.4.8 withr_3.0.2
[50] scales_1.4.0 promises_1.3.3 timechange_0.3.0 httr_1.4.7 rmarkdown_2.29 memoise_2.0.1 evaluate_1.0.5
[57] miniUI_0.1.2 viridisLite_0.4.2 profvis_0.4.0 Rcpp_1.1.0 xtable_1.8-4 glue_1.8.0 xml2_1.4.0
[64] pkgload_1.4.0 svglite_2.2.1 rstudioapi_0.17.1 jsonlite_2.0.0 R6_2.6.1 plyr_1.8.9 systemfonts_1.2.3
[71] fs_1.6.6

2

As a first step I'd suggest to type shiny::devmode() into your R console and re-run the app to get a full error trace.

3

Done as you suggested, this is the output:

37: h
36: .handleSimpleError
35: has_one
34: map$has
33: inputHandlers$containsKey
32:
31: mapply
30: applyInputHandlers
29: force
28: domain$wrapSync
27: promises::with_promise_domain
26: withReactiveDomain
25: messageHandler
24: withCallingHandlers
23: domain$wrapSync
22: promises::with_promise_domain
21: captureStackTraces
20: withCallingHandlers
19: withLogErrors
18: handler
17: doTryCatch
16: tryCatchOne
15: tryCatchList
14: tryCatch
13: try
12:
11: execCallbacks
10: run_now
9: service
8: serviceApp
7: ..stacktracefloor..
6: withCallingHandlers
5: domain$wrapSync
4: promises::with_promise_domain
3: captureStackTraces
2: ..stacktraceoff..
1: runApp

4

applyInputHandlers is defined here.

There may be a compatibility issue with a library that provides additional inputs.

Can you find out which library is causing the problem?

5

I was able to solve the problem, hard to find but easy to fix...

In one of my multiple tab pages a table was named
DT::dataTableOutput("TOCTab.ValueTable::", height = "400px") instead of only DT::dataTableOutput("TOCTab.ValueTable", height = "400px").

The two colons caused the problem.
I guess I've introduced the problem via copy&paste.

Thanks for taking the time to look into the problem!