PostGresSQL-6.4 backend killed connection to PSQL

Your name : Torsten Knodt
Your email address : torstenknodt(at)memoryalpha(dot)rhein-main(dot)de

System Configuration
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Architecture (example: Intel Pentium) : P54C-200, 128MB

Operating System (example: Linux 2.0.26 ELF) : Linux 2.0.36 ELF

PostgreSQL version (example: PostgreSQL-6.4) : PostgreSQL-6.4

Compiler used (example: gcc 2.8.0) : gcc 2.7.2.3

Please enter a FULL description of your problem:
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PSQL looses backend connection with select in pqReadData.

Please describe a way to repeat the problem. Please try to provide a
concise reproducible example, if at all possible:
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I've appended a party dump of the database without data.
The table "Adressen" had 7000 entries.
I've used the following command:
SELECT A.* FROM "Adressen" A, Doppelt_Name_Strase D WHERE
(A."Name"=D."Name") AND (A."Strasse"=D."Strasse");

If you know how this problem might be fixed, list the solution below:
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Sorry, no solution.