Segmentation fault - SIGSEGV and premature close

[claudioder]

I am running WiFiDog 1.3.0 on LEDE 17.0.2, platform TP-Link WR1043ND v4.
The system works fine, but sometimes WiFiDog restarted prematurely, kicking out all authenticated users.
Logread messages reveal this. This in particolar occur when a user connect for the first time, triggering the captive portal.

wifidog[11505]: rule mask x.x.x.x/24
wifidog[11505]: host [***USERURL***] is not in x.x.x.x/24, continue
wifidog[11505]: Captured [***LOCALIP***] requesting [***USERURL***]
kernel: [72247.024116] do_page_fault(): sending SIGSEGV to wifidog for invalid write access to 00000000
kernel: [72247.033621] epc = 77f4e800 in libc.so[77f30000+92000]
kernel: [72247.039724] ra  = 77f1d767 in libhttpd.so.0.0.0[77f1a000+14000]

After this error, wifidog sometimes restart, other times remain off.
Is it possible to generate a patch to fix this issue or maybe is a problem in my config file?