Search doesn't work the app crashes

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E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.queerdevs.raj.paginationdemoinrecyclerview, PID: 24539
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.String.substring(int, int)' on a null object reference
at com.queerdevs.raj.paginationdemoinrecyclerview.PaginationAdapter.onBindViewHolder(PaginationAdapter.java:87)
at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:6781)
at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:6823)
at android.support.v7.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:5752)
at android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:6019)
at android.support.v7.widget.GapWorker.prefetchPositionWithDeadline(GapWorker.java:286)
at android.support.v7.widget.GapWorker.flushTaskWithDeadline(GapWorker.java:343)
at android.support.v7.widget.GapWorker.flushTasksWithDeadline(GapWorker.java:359)
at android.support.v7.widget.GapWorker.prefetch(GapWorker.java:366)
at android.support.v7.widget.GapWorker.run(GapWorker.java:397)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7050)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:494)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:965)
I/Process: Sending signal. PID: 24539 SIG: 9