(Please note the version from the title, I could not find it in the relevant field when filing the bug)
Independent of the view mode, when I enable previews and then go to 'Configure Dolphin' in the Control menu, Dolphin crashes. The same happens if the previews are already enabled, I switch them off and the re-enable them. This happens no matter what the configuration of Dolphin is.

If I start Dolphin again, I can go to 'Configure Dolphin' without problems. No crash happens if I enable the previews, then exit Dolphin, and start it again either.

Reproducible: Always

Steps to Reproduce:
1. Run Dolphin
2. Enable or re-enable the Previews
3. Go to Control->Configure Dolphin

Actual Results:  
Dolphin crashes.

Expected Results:  
The configuration dialog should open.

I ran Dolphin through the terminal and this is the output I got:

"Trying to convert empty KLocalizedString to QString."
The font for use in the terminal has not been matched exactly. Perhaps it has not been found properly.
The font for use in the terminal has not been matched exactly. Perhaps it has not been found properly.
Attempted to re-run an already running session.
KSambaShare: Could not find smb.conf!
(Below is the output after I started executing the steps to reproduce the bug)
org.kde.dolphin: Saving view-properties to "/home/nikos"
org.kde.dolphin: Saving view-properties to "/home/nikos"
QWidget::insertAction: Attempt to insert null action
QLayout: Cannot add a null widget to QVBoxLayout/
QLayout: Cannot add a null widget to QVBoxLayout/
initialization OK, home trash dir: "/home/nikos/.local/share/Trash"
"Tag 'b' is not defined in message {<__kuit_internal_top__><para>Check this box to allow <b>automatic deletion</b> o...}."
"Tag 'b' is not defined in message {<__kuit_internal_top__><para>Check this box to allow <b>automatic deletion</b> o...}."
QLayout: Attempting to add QLayout "" to PreviewsSettingsPage "", which already has a layout
Segmentation fault (core dumped)