Spinner and OS force quit on long-running import of 1pif file

[canadaduane]

Synopsis: OS thinks UI is frozen during long-running import and force quits before import completes.

I'm trying to import a large-ish 1password "1pif" file--about 2000 logins from websites I've visited over the past 10 years or so. When I select the file for import, Buttercup immediately shows a spinner as if it's importing, but it never finishes. There are no errors in the debug console, and no errors in the log file (~/.local/state/Buttercup-nodejs/buttercup-desktop.log). I've even tried letting it run overnight; however, the operating system seems to detect Buttercup's activity as "non-responsive" and shows a dialog to let me "force quit", or (as it seems) kills the process automatically if I don't respond to the dialog after some time.

I've been able to split the "1pif" file into smaller pieces, and the import seems to be working in that case. So it appears that it's just taking a (very) long time, and tricking the OS into thinking its UI is frozen?

I'm on Linux/Ubuntu (Pop!_OS 21.04).

[canadaduane]

Ok, I'm a little confused now. I'm seeing something similar to buttercup/buttercup-desktop#1017 with the same error message in logs. I wasn't seeing this before.

[ERR] 06:06:21: Failed importing TypeError [ERR_INVALID_ARG_TYPE]: The first argument must be of type string or an instance of Buffer, ArrayBuffer, or Array or an Array-like Object. Received undefined
at from               buffer.js:333                                                                                                                                 
at encodeBase64       ….asar/node_modules/buttercup/dist/env/native/encoding.js:26  return Buffer.from(text, "utf8").toString("base64");                            
at encodeStringValue  …s/app.asar/node_modules/buttercup/dist/tools/encoding.js:70  return `${exports.ENCODED_STRING_PREFIX}${encode(value)}`;                      
at wrap               …app.asar/node_modules/buttercup/dist/io/formatA/tools.js:24  wrap: (txt) => encoding_1.encodeStringValue(txt),                               
at addArgument        …app.asar/node_modules/buttercup/dist/io/formatA/tools.js:76  this._commandArgs.push(newArgRule.wrap(arg));                                   
at setEntryProperty   …app.asar/node_modules/buttercup/dist/io/VaultFormatA.js:345  .addArgument(value)                                                             
at setProperty        …rces/app.asar/node_modules/buttercup/dist/core/Entry.js:230  this.vault.format.setEntryProperty(this.id, property, value);                   
at                    …@buttercup/importer/dist/importers/OnePasswordImporter.js:6  */function mapTreeLevelToVault(parentVaultItem,treeLevel){const group=parentVau…
at forEach                                                                                                                                                          
at                    …@buttercup/importer/dist/importers/OnePasswordImporter.js:6  */function mapTreeLevelToVault(parentVaultItem,treeLevel){const group=parentVau…