Perl::Tk and "is not a hash" error

2016-08-09 19:23:13, In: Linux, Perl, Debian

In Debian 8 (Jessie), after installing Perl::Tk, all scripts return the following error whenever Perl::Tk main loop is called:
2773678 is not a hash at /usr/local/lib/x86_64-linux-gnu/perl/5.20.2/Tk/MainWindow.pm line 53.
Line number may be different depending on Tk library version. Path usually will be different too (your architecture may differ), the most important thing here is this is not a hash error. The source of this problem is with using legacy form color parameter. In earlier X Window versions, colors responsible for window theming were stored as X Window system resources. This was never done completely in Linux, and the last desktop which done it in larger part was CDE from 1990s, and most Linux software just ignored parameters if there were any. However, some definitions survived until few years ago X have been updated. But Perl::Tk still needs some colour definition in order to generate a dialog window - it needs to know the background color.
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