diff --git a/app/src/main/java/org/grapheneos/pdfviewer/PdfViewer.java b/app/src/main/java/org/grapheneos/pdfviewer/PdfViewer.java
index e4d5a7a..8fbf253 100644
--- a/app/src/main/java/org/grapheneos/pdfviewer/PdfViewer.java
+++ b/app/src/main/java/org/grapheneos/pdfviewer/PdfViewer.java
@@ -288,6 +288,10 @@ public class PdfViewer extends AppCompatActivity implements LoaderManager.Loader
                 return;
             }
             mUri = intent.getData();
+            if ("file".equals(mUri.getScheme())) {
+                Log.e(TAG, "invalid legacy file URI: " + mUri);
+                return;
+            }
             mPage = 1;
         }