Application error occurs when I finish using the Benchmark feature [Privacy Friendly Password Generator v1.0.3]

Expected behavior

I expected the app to exit the benchmark feature (when I click on 'Done') without crashing.

Actual behavior

I clicked on the 'START' button and the time was shown. I clicked again and observed the time that was shown got updated. Then I kept clicking on the 'START' button so the time would keep updating. Afterwards, I clicked on the 'DONE' button and there was an application error. I noticed that the application error occurs whenever the time is above 2 seconds.

How to reproduce

Download, install and launch the latest version of the app
Go to settings
Scroll down to the last option 'Benchmark: generation'
Click on it
Click on the 'START' button and till the time shown is above 2 seconds (maybe 3 seconds)
Click on the 'DONE' button
Observe the bug.

Device: Gionee f100s Android version: v6.0 App version: v1.0.3

Recording of the bug

Logcat


06-15 10:17:30.166 956-2216/? V/WindowManager: findFocusedWindow: Found new focus @ 3 = Window{24d544a u0 org.secuso.privacyfriendlypasswordgenerator/org.secuso.privacyfriendlypasswordgenerator.activities.SettingsActivity}
06-15 10:17:30.168 956-2216/? V/WindowManager: Set focused app to: AppWindowToken{53f09a8 token=Token{69badcb ActivityRecord{21f909a u0 org.secuso.privacyfriendlypasswordgenerator/.activities.MainActivity t5150}}} old focus=AppWindowToken{9051dec token=Token{30f23fd ActivityRecord{f4f1854 u0 org.secuso.privacyfriendlypasswordgenerator/.activities.SettingsActivity t5150}}} moveFocusNow=true
06-15 10:17:30.169 956-2216/? V/WindowManager: findFocusedWindow: Found new focus @ 3 = Window{24d544a u0 org.secuso.privacyfriendlypasswordgenerator/org.secuso.privacyfriendlypasswordgenerator.activities.SettingsActivity}
06-15 10:17:30.182 956-27597/? D/AES:     process : org.secuso.privacyfriendlypasswordgenerator
06-15 10:17:30.182 956-27597/? D/AES:      module : org.secuso.privacyfriendlypasswordgenerator v4 (1.0.3)
06-15 10:17:30.183 956-27597/? D/AEE/LIBAEE: shell: raise_exp(4, 27536, -1361051648, org.secuso.privacyfriendlypasswordgenerator, 0x0x96a8bbe0, 0x0x0)
06-15 10:17:30.185 27598-27598/? I/AEE/AED: [OnPurpose Redunant in void preset_info(aed_report_record*, int, int)] pid: 27536, tid: -1361051648, name: UNKNOWN  >>> org.secuso.privacyfriendlypasswordgenerator <<<
06-15 10:17:30.185 27598-27598/? V/AEE/AED: dashboard_record_update() : rec->module = org.secuso.privacyfriendlypasswordgenerator 
06-15 10:17:30.185 27598-27598/? D/AEE/AED: Module: org.secuso.privacyfriendlypasswordgenerator 
06-15 10:17:30.188 956-990/? D/ViewRootImpl: hardware acceleration is enabled, this = ViewRoot{b0dc712 Application Error: org.secuso.privacyfriendlypasswordgenerator,ident = 73}
06-15 10:17:30.188 956-990/? D/WindowManager: addWindowToListInOrderLocked: win=Window{3a790e0 u0 Application Error: org.secuso.privacyfriendlypasswordgenerator}
06-15 10:17:30.188 956-990/? V/WindowManager: Free window: Adding window Window{3a790e0 u0 Application Error: org.secuso.privacyfriendlypasswordgenerator} at 4 of 10
06-15 10:17:30.189 956-990/? V/WindowManager: findFocusedWindow: Found new focus @ 4 = Window{3a790e0 u0 Application Error: org.secuso.privacyfriendlypasswordgenerator}
06-15 10:17:30.189 956-990/? V/WindowManager: Changing focus from Window{24d544a u0 org.secuso.privacyfriendlypasswordgenerator/org.secuso.privacyfriendlypasswordgenerator.activities.SettingsActivity} to Window{3a790e0 u0 Application Error: org.secuso.privacyfriendlypasswordgenerator}
06-15 10:17:30.189 956-990/? D/WindowManager: Input focus has changed to Window{3a790e0 u0 Application Error: org.secuso.privacyfriendlypasswordgenerator}
06-15 10:17:30.189 956-1021/? I/WindowManager: Focus moving from Window{24d544a u0 org.secuso.privacyfriendlypasswordgenerator/org.secuso.privacyfriendlypasswordgenerator.activities.SettingsActivity} to Window{3a790e0 u0 Application Error: org.secuso.privacyfriendlypasswordgenerator}
06-15 10:17:30.189 956-1021/? I/WindowManager: Gaining focus: Window{3a790e0 u0 Application Error: org.secuso.privacyfriendlypasswordgenerator}
06-15 10:17:30.200 256-256/? D/BufferQueueDump: [Application Error: org.secuso.privacyfriendlypasswordgenerator] this:0xb5aee460, value:0xbee3a690, iLen:6
06-15 10:17:30.201 956-990/? V/WindowManager: findFocusedWindow: Found new focus @ 4 = Window{3a790e0 u0 Application Error: org.secuso.privacyfriendlypasswordgenerator}
06-15 10:17:30.216 956-3322/? D/OpenGLRenderer: CanvasContext() 0x9ed85800 initialize window=0x9e524008, title=Application Error: org.secuso.privacyfriendlypasswordgenerator
06-15 10:17:30.237 956-1021/? I/WindowManager: Losing delayed focus: Window{24d544a u0 org.secuso.privacyfriendlypasswordgenerator/org.secuso.privacyfriendlypasswordgenerator.activities.SettingsActivity}
06-15 10:17:30.670 956-989/? W/ActivityManager: Activity pause timeout for ActivityRecord{f4f1854 u0 org.secuso.privacyfriendlypasswordgenerator/.activities.SettingsActivity t5150 f} ```

SecUSo / privacy-friendly-passwordgenerator