I can confirm this crash. Please report upstream.
Here is the meaningful part of the backtrace:
#6 0x00007f9607380d80 in strlen () from /lib/libc.so.6
#7 0x00007f95f13a45b0 in gcpTextTool::OnGetData (this=0xc63ba0,
clipboard=0xf9d030, selection_data=0x7fff102da5f0,
info=<value optimized out>) at texttool.cc:624
--
gchempaint crashed with SIGSEGV in strlen()
https://bugs.launchpad.net/bugs/219138
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