Discover crash when searching for an application

Reproducible: Always

Steps to Reproduce:
1. Start discover
2. Click on the search field
3. Type the application name

Actual Results:  
Crash

Expected Results:  
It should not crash.

GNU gdb (Ubuntu 7.11.1-0ubuntu1~16.04) 7.11.1
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Reading symbols from /usr/bin/plasma-discover...(no debugging symbols found)...done.
Attaching to program: /usr/bin/plasma-discover, process 2057
Could not attach to process.  If your uid matches the uid of the target
process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try
again as the root user.  For more details, see /etc/sysctl.d/10-ptrace.conf
ptrace: Operation not permitted.
(gdb) run
Starting program: /usr/bin/plasma-discover 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffe7513700 (LWP 2130)]
[New Thread 0x7fffdebdd700 (LWP 2131)]
[New Thread 0x7fffdd9cc700 (LWP 2132)]
[New Thread 0x7fffd553f700 (LWP 2133)]
The file  "/home/lucas/.local/share/knewstuff3/.knsregistry"  could not be opened.
The file  "/home/lucas/.local/share/knewstuff3/.knsregistry"  could not be opened.
The file  "/home/lucas/.local/share/knewstuff3/.knsregistry"  could not be opened.
no packages for "UEFI Updates"
no packages for "Rival SteelSeries"
no packages for "VL812 Firmware"
no packages for "VL811 Firmware"
no packages for "VL811+ Firmware"
no packages for "VL812 B2 Firmware"
needed... 1515
[New Thread 0x7fffc7b6a700 (LWP 2138)]
[New Thread 0x7fffc663e700 (LWP 2139)]
[New Thread 0x7fffc5e3d700 (LWP 2140)]
[New Thread 0x7fffc4e20700 (LWP 2141)]
The wallet service was disabled by the user
Pass a valid window to KWallet::Wallet::openWallet().
User disabled the wallet system so returning 0 here.
Pass a valid window to KWallet::Wallet::openWallet().
User disabled the wallet system so returning 0 here.
Pass a valid window to KWallet::Wallet::openWallet().
User disabled the wallet system so returning 0 here.
qml: application  krita.desktop  not found
qml: application  kdevelop.desktop  not found
Pass a valid window to KWallet::Wallet::openWallet().
User disabled the wallet system so returning 0 here.
qml: application  krita.desktop  not found
qml: application  kdevelop.desktop  not found

Thread 1 "plasma-discover" received signal SIGSEGV, Segmentation fault.
0x00007fffc8d822a8 in KNS3::Entry::size() const ()
   from /usr/lib/x86_64-linux-gnu/libKF5NewStuff.so.5
(gdb)