Android App crashes with PID: 20777 SIG: 9 after I instrument it in Ranorex 8.3

I am really new to this stuff so I'll be stupid as hell in describing what the heck is going on. I instrumented APK in Ranorex studio so I could do auto-tests on it but after instrumentation APK stops working properly and just started crashing with no messages and stuff. I went to Android Studio and checked out what in the APP logs:

11-22 18:27:12.455 20777-20777/? I/art: Late-enabling -Xcheck:jni 
11-22 18:27:12.544 20777-20777/com.buhphone.web I/MultiDex: VM with version 2.1.0 has multidex support 
11-22 18:27:12.545 20777-20777/com.buhphone.web I/MultiDex: Installing application 
11-22 18:27:12.545 20777-20777/com.buhphone.web I/MultiDex: VM has multidex support, MultiDex support library is disabled. 
11-22 18:27:12.779 20777-20777/com.buhphone.web I/EMOJIS: decoder init 
11-22 18:27:12.839 20777-20795/com.buhphone.web I/stetho: Listening on @stetho_com.buhphone.web_devtools_remote 
11-22 18:27:12.984 20777-20777/com.buhphone.web W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable 
11-22 18:27:13.046 20777-20777/com.buhphone.web I/art: Rejecting re-init on previously-failed class java.lang.Class<android.support.v4.view.ViewCompat$OnUnhandledKeyEventListenerWrapper> 
11-22 18:27:13.046 20777-20777/com.buhphone.web I/art: Rejecting re-init on previously-failed class java.lang.Class<android.support.v4.view.ViewCompat$OnUnhandledKeyEventListenerWrapper> 
11-22 18:27:13.507 20777-20777/com.buhphone.web I/Process: Sending signal. PID: 20777 SIG: 9

I really need help with solving this problem, so I count on you c: