The following bug has been logged online:

Bug reference: 1979
Logged by: li fei
Email address: li_fei_@hotmail.com
PostgreSQL version: 8.1-Beta3
Operating system: Windows XP sp2
Description: count operation error in pgAdmin III 1.4.0Beta2
Details:

When one Table was Selected and Execute count operation(Display->count or
menu->count),then appear error and pgAdmin close.

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TIP 2: Don't 'kill -9' the postmaster