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Attempt to invoke virtual method 'java.lang.String java.lang.String.replaceFirst(java.lang.String, java.lang.String)' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.String.replaceFirst(java.lang.String, java.lang.String)' on a null object reference	at fr.free.nrw.commons.Utils.makeThumbBaseUrl(Utils.java:52)	at fr.free.nrw.commons.Media.getImageUrl(Media.java:62)	at fr.free.nrw.commons.Media.getThumbnailUrl(Media.java:108)	at fr.free.nrw.commons.media.MediaDetailFragment.displayMediaDetails(MediaDetailFragment.java:187)	at fr.free.nrw.commons.media.MediaDetailFragment.onCreateView(MediaDetailFragment.java:147)	at android.support.v4.app.Fragment.performCreateView(Fragment.java:1974)	at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1067)	at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1252)	at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:742)	at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1617)	at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:570)	at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:164)	at android.support.v4.view.ViewPager.populate(ViewPager.java:1177)	at android.support.v4.view.ViewPager.populate(ViewPager.java:1025)	at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1545)	at android.view.View.measure(View.java:18596)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5827)	at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1435)	at android.widget.LinearLayout.measureVertical(LinearLayout.java:721)	at android.widget.LinearLayout.onMeasure(LinearLayout.java:612)	at android.view.View.measure(View.java:18596)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5827)	at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)	at android.view.View.measure(View.java:18596)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5827)	at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)	at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135)	at android.view.View.measure(View.java:18596)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5827)	at android.support.v7.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:391)	at android.view.View.measure(View.java:18596)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5827)	at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)	at android.view.View.measure(View.java:18596)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5827)	at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1435)	at android.widget.LinearLayout.measureVertical(LinearLayout.java:721)	at android.widget.LinearLayout.onMeasure(LinearLayout.java:612)	at android.view.View.measure(View.java:18596)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5827)	at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)	at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2897)	at android.view.View.measure(View.java:18596)	at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2248)	at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1306)	at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1548)	at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1191)	at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6642)	at android.view.Choreographer$CallbackRecord.run(Choreographer.java:777)	at android.view.Choreographer.doCallbacks(Choreographer.java:590)	at android.view.Choreographer.doFrame(Choreographer.java:560)	at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:763)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:145)	at android.app.ActivityThread.main(ActivityThread.java:5951)	at java.lang.reflect.Method.invoke(Native Method)	at java.lang.reflect.Method.invoke(Method.java:372)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)