Bug 419803

SUMMARY
Dolphin occasionally crashes when no argument is given to it.

STEPS TO REPRODUCE
1. Run `dolphin`
2. Dolphin sometimes crashes

OBSERVED RESULT
Dolphin sometimes crashes at about 25%-50% of the time.

EXPECTED RESULT
Dolphin doesn't crash.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux
KDE Plasma Version: 5.18.4
KDE Frameworks Version: 5.68.0
Qt Version: 5.14.2

ADDITIONAL INFORMATION
The crash log I got from terminal:

"""
Icon theme "gnome" not found.
malloc(): unsorted double linked list corrupted
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = dolphin path = /usr/bin pid = 2712728
KCrash: Arguments: /usr/bin/dolphin 
^[[A^[[fish: “dolphin” terminated by signal SIGALRM (Timer expired)
"""

The crash log I got from gdb, running dolphin with debug symbols:

"""
(gdb) r
Starting program: /usr/bin/dolphin 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[New Thread 0x7fffef7d4700 (LWP 2712157)]
[New Thread 0x7fffeec1a700 (LWP 2712158)]
Icon theme "gnome" not found.
[New Thread 0x7fffeccef700 (LWP 2712159)]
[New Thread 0x7fffe68e8700 (LWP 2712160)]
[New Thread 0x7fffe60e7700 (LWP 2712161)]
[New Thread 0x7fffe58e6700 (LWP 2712162)]
[New Thread 0x7fffe50e5700 (LWP 2712163)]
[New Thread 0x7fffdb1b2700 (LWP 2712169)]
malloc(): unsorted double linked list corrupted

Thread 1 "dolphin" received signal SIGABRT, Aborted.
"""