I got the same Problem with my scanner (Lexmark MX317dn). With Ubuntu 18.04 
there were no problems, but with Ubuntu 20.04 I receive the following error 
message:
(xsane:7709): Gdk-CRITICAL **: 11:27:45.419: IA__gdk_drawable_unref: assertion 
'GDK_IS_DRAWABLE (drawable)' failed

(xsane:7709): Gdk-CRITICAL **: 11:27:45.419: IA__gdk_drawable_unref: assertion 
'GDK_IS_DRAWABLE (drawable)' failed
terminate called after throwing an instance of 'std::logic_error'
  what():  basic_string::_S_construct null not valid

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https://bugs.launchpad.net/bugs/1877639

Title:
  Xsane crashes with preview

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