command-not-found announces crash on typing short word

[Stéphane Gourichon]

### Context : Ubuntu precise 12.04 AMD64.

### Action : type something not an existing command

### Reproducible : rare.
Happened twice in about a month while using the shell extensively every day.

### Expected:
$ tidz
No command 'tidz' found, did you mean:
 Command 'tidy' from package 'tidy' (main)
 Command 'tide' from package 'xtide' (universe)
tidz: command not found

### Observed:
$ tidy
Sorry, command-not-found has crashed! Please file a bug report at:
https://bugs.launchpad.net/command-not-found/+filebug
Please include the following information with the report:

command-not-found version: 0.2.44

### Additional information :

* Can't remember what (mistyped) command yielded the first crash. It was very short, like "odp".
* Shell has been used for hours, ran many commands, defined associative arrays (small content).

$ lsb_release -rd
Description: Ubuntu 12.04 LTS
Release: 12.04

$ apt-cache policy command-not-found
command-not-found:
  Installed: 0.2.46ubuntu6
  Candidate: 0.2.46ubuntu6
  Version table:
 *** 0.2.46ubuntu6 0
        500 http://fr.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: command-not-found 0.2.46ubuntu6
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
Uname: Linux 3.2.0-24-generic x86_64
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
Date: Tue May 8 21:45:21 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120419)
PackageArchitecture: all
SourcePackage: command-not-found
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Stéphane Gourichon (stephane-gourichon-lpad)]

Just happened again 2012y05m09d-10h36m42s

$ acpi
Sorry, command-not-found has crashed! Please file a bug report at:
https://bugs.launchpad.net/command-not-found/+filebug
Please include the following information with the report:

command-not-found version: 0.2.44