Schema migration issue - multiple tabs

[gligorevic]

When multiple tabs are open and a schema version update is triggered (with migrations enabled), only one tab migrates successfully. The other tabs enter an infinite loop, resulting in the following error message:

idb performSave failed: TypeError: Cannot read properties of null (reading 'forEach')
at incremental-indexeddb-adapter.js:519:21
at Array.forEach ()
at k.d [as getData] (incremental-indexeddb-adapter.js:512:24)
at k.get [as data] (lokijs.wmelon.js:1314:31)
at k.ensureId (lokijs.wmelon.js:3397:23)
at t._getChunk (incremental-indexeddb-adapter.js:76:18)
at f (incremental-indexeddb-adapter.js:316:32)
at u (incremental-indexeddb-adapter.js:337:13)
at Array.forEach ()
at t._putInChunks (incremental-indexeddb-adapter.js:370:24)

[kokusGr]

I have a partial fix in this PR: #1921. It doesn't address only one tab migrating, but at least the app shouldn't go into an infinite loop and still work correctly.