[scribus] scribus 1.5.3 crashes when trying to modify a style with #6

[Karl-Wilhelm Frommeyer]

Dear colleagues,
I'm working on a longer file and defined and changes several times the chapter styles. I'm using Kubuntu 16.04, Kernel 4.4.0.83-generic 64-bit.
Now when trying to modify a style scribus crashes at once.
More below.
Will there be a patch?
Kind regards Karl-Wilhelm

Karl-Wilhelm Frommeyer
Hachbergstr. 1, 79664 Wehr
Tel. 07762 2887

pathForIcon: Unable to load icon /usr/share/scribus-ng/icons/1_5_1/zeichen.png: File not found
setBestEncoding for  Fontin-Regular  with  239 glyphs, hasNames= 512 , POST size= 560
Checking cmap  0 ( 0 , 3 , 0 ) format  4
found Unicode enc for Fontin Regular as map 0 with 233 glyphs
Checking cmap  1 ( 1 , 0 , 0 ) format  0
Checking cmap  2 ( 3 , 1 , 0 ) format  4
found Unicode enc for Fontin Regular as map 2 with 466 glyphs
using Unicode enc for Fontin Regular
load post 0 560
setBestEncoding for  ZapfHumanist601BT-Bold  with  261 glyphs, hasNames= 512 , POST size= 586
Checking cmap  0 ( 1 , 0 , 0 ) format  0
Checking cmap  1 ( 3 , 1 , 0 ) format  4
found Unicode enc for ZapfHumnst BT Bold as map 1 with 259 glyphs
using default enc for ZapfHumnst BT Bold
load post 0 586
setBestEncoding for  ZapfHumanist601BT-Roman  with  261 glyphs, hasNames= 512 , POST size= 586
Checking cmap  0 ( 1 , 0 , 0 ) format  0
Checking cmap  1 ( 3 , 1 , 0 ) format  4
found Unicode enc for ZapfHumnst BT Roman as map 1 with 259 glyphs
using default enc for ZapfHumnst BT Roman
load post 0 586
pulling 1 lines
setBestEncoding for  LiberationSerif-Italic  with  678 glyphs, hasNames= 512 , POST size= 5307
Checking cmap  0 ( 0 , 3 , 0 ) format  4
found Unicode enc for Liberation Serif Italic as map 0 with 667 glyphs
Checking cmap  1 ( 1 , 0 , 0 ) format  6
Checking cmap  2 ( 3 , 1 , 0 ) format  4
found Unicode enc for Liberation Serif Italic as map 2 with 1334 glyphs
using Unicode enc for Liberation Serif Italic
load post 0 5307
pulling 2 lines
ASSERT: "di != -1" in file /build/scribus-ng-9TlqND/scribus-ng-1.5.3/scribus/ui/smcstylewidget.cpp, line 341
scribus-ng: /build/scribus-ng-9TlqND/scribus-ng-1.5.3/scribus/scribuscore.cpp:89: void abort_on_error(QtMsgType, const QMessageLogContext&, const QString&): Zusicherung »false« nicht erfüllt.
Scribus ist abgestürzt
-------------
Absturz durch Signal #6