After upgrading from High Sierra to Mojave I started encountering the following error:

$ lpass login <username>
lpass(1773,0x10e0ec5c0) malloc: *** error for object 0xec83485354415541: pointer being freed was not allocated
lpass(1773,0x10e0ec5c0) malloc: *** set a breakpoint in malloc_error_break to debug

This issue appears to be with lpass itself, after upgrading to Mojave. The issue was reported in various forms on the LastPass Github project page for lastpass-cli. Specifically this issue: Segfaults on macOS Mojave Beta #427.

The solution is pretty straightforward. Simply upgrading lastpass-cli via brew like so:

$ brew upgrade lastpass-cli

Resulting in this version being installed which fixes the malloc issue mentioned.

$ brew info lastpass-cli
lastpass-cli: stable 1.3.3 (bottled), HEAD
LastPass command-line interface tool
/usr/local/Cellar/lastpass-cli/1.3.3 (10 files, 216.6KB) *
  Poured from bottle on 2019-04-15 at 15:15:05
From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/lastpass-cli.rb
==> Dependencies
Build: asciidoc ✘, cmake ✘, docbook-xsl ✔, pkg-config ✔
Required: curl ✔, openssl ✔, pinentry ✔
==> Options
    Install HEAD version
==> Caveats
Bash completion has been installed to:

zsh completions have been installed to:
==> Analytics
install: 2,555 (30 days), 5,077 (90 days), 18,589 (365 days)
install_on_request: 2,378 (30 days), 4,832 (90 days), 17,108 (365 days)
build_error: 0 (30 days)

Version details from CLI:

$ lpass --version
LastPass CLI v1.3.3.GIT

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