Fix

Signed-off-by: alperozturk <alper_ozturk@proton.me>

app/src/main/java/com/owncloud/android/ui/fragment/OCFileListFragment.java

@@ -647,7 +647,7 @@ public class OCFileListFragment extends ExtendedListFragment implements
 
     @Override
     public void onHeaderClicked() {
-        if (!getAdapter().isMultiSelect() && mContainerActivity instanceof FileDisplayActivity) {
+        if (getAdapter() != null && !getAdapter().isMultiSelect() && mContainerActivity instanceof FileDisplayActivity) {
             ((FileDisplayActivity) mContainerActivity).startRichWorkspacePreview(getCurrentFile());
         }
     }
@@ -1075,7 +1075,7 @@ public class OCFileListFragment extends ExtendedListFragment implements
             fileActivity.checkInternetConnection();
         }
 
-        if (getCommonAdapter().isMultiSelect()) {
+        if (getCommonAdapter() != null && getCommonAdapter().isMultiSelect()) {
             toggleItemToCheckedList(file);
         } else {
             if (file != null) {
@@ -1205,9 +1205,8 @@ public class OCFileListFragment extends ExtendedListFragment implements
                 return;
             }
 
-            int position = getCommonAdapter().getItemPosition(file);
+            if (getCommonAdapter() != null && file.isFolder()) {
-
+                int position = getCommonAdapter().getItemPosition(file);
-            if (file.isFolder()) {
                 folderOnItemClick(file, position);
             } else if (mFileSelectable) {
                 Intent intent = new Intent();