java.lang.NullPointerException: Attempt to invoke virtual method 'void android.graphics.drawable.Drawable.setColorFilter(int, android.graphics.PorterDuff$Mode)' on a null object reference at pl..smok.ui.activity.MainActivity$2.onTabUnselected(MainActivity.java:163)

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Java android change color tab selected tab

Attempt to invoke virtual method 'void android.graphics.drawable.Drawable.setColorFilter(int, android.graphics.PorterDuff$Mode)' on a null object reference at pl..smok.ui.activity.MainActivity$2.onTabUnselected(MainActivity.java:163)

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.graphics.drawable.Drawable.setColorFilter(int, android.graphics.PorterDuff$Mode)' on a null object reference
                                                                            at pl..smok.ui.activity.MainActivity$2.onTabUnselected(MainActivity.java:163)	at android.support.design.widget.TabLayout.dispatchTabUnselected(TabLayout.java:1163)	at android.support.design.widget.TabLayout.selectTab(TabLayout.java:1149)	at android.support.design.widget.TabLayout.selectTab(TabLayout.java:1124)	at android.support.design.widget.TabLayout$Tab.select(TabLayout.java:1419)	at android.support.design.widget.TabLayout$TabView.performClick(TabLayout.java:1524)	at android.view.View$PerformClick.run(View.java:22526)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:158)	at android.app.ActivityThread.main(ActivityThread.java:7224)	at java.lang.reflect.Method.invoke(Native Method)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)