[BUG] Cannot read properties of undefined (reading 'map') #2064
Description
Hi, I've just updated to the last version of dash, and now get a cryptic error Cannot read properties of undefined (reading 'map') (on chrome) or y is undefined (on firefox) (full traceback below). The update is the only change. Any suggestions? :)
It's probably related to the go.Choropleth part of the code as it doesn't display properly. I haven't been able to create a minimal example but full code here.
Thanks!
I updated from:
dash==1.4.1 dash-core-components==1.3.1 dash-html-components==1.0.1 dash-renderer==1.1.2 dash-table==4.4.1 to:
dash==2.4.1 dash-bootstrap-components==1.1.0 dash-core-components==2.0.0 dash-html-components==2.0.0 dash-renderer==1.1.2 dash-table==5.0.0 EDIT: I've narrowed it down to 2 specific releases of dash:
- 1.8.0 is when the choropleth map stopped displaying (showing an empty div instead) but with no error message
- 2.4.0 is when the error message mentioned here appeared
Full traceback on Chrome:
TypeError: Cannot read properties of undefined (reading 'map') at http://127.0.0.1:8050/_dash-component-suites/dash/dcc/async-dropdown.js:2:4888 at commitHookEffectListMount (http://127.0.0.1:8050/_dash-component-suites/dash/deps/react-dom@16.v2_4_1m1653310444.14.0.js:19866:28) at commitPassiveHookEffects (http://127.0.0.1:8050/_dash-component-suites/dash/deps/react-dom@16.v2_4_1m1653310444.14.0.js:19904:13) at HTMLUnknownElement.callCallback (http://127.0.0.1:8050/_dash-component-suites/dash/deps/react-dom@16.v2_4_1m1653310444.14.0.js:182:16) at Object.invokeGuardedCallbackDev (http://127.0.0.1:8050/_dash-component-suites/dash/deps/react-dom@16.v2_4_1m1653310444.14.0.js:231:18) at invokeGuardedCallback (http://127.0.0.1:8050/_dash-component-suites/dash/deps/react-dom@16.v2_4_1m1653310444.14.0.js:286:33) at flushPassiveEffectsImpl (http://127.0.0.1:8050/_dash-component-suites/dash/deps/react-dom@16.v2_4_1m1653310444.14.0.js:22988:11) at unstable_runWithPriority (http://127.0.0.1:8050/_dash-component-suites/dash/deps/react@16.v2_4_1m1653310444.14.0.js:2685:14) at runWithPriority$1 (http://127.0.0.1:8050/_dash-component-suites/dash/deps/react-dom@16.v2_4_1m1653310444.14.0.js:11174:12) at flushPassiveEffects (http://127.0.0.1:8050/_dash-component-suites/dash/deps/react-dom@16.v2_4_1m1653310444.14.0.js:22955:14) Metadata
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