diff --git a/app/src/fdroid/java/fr.gouv.etalab.mastodon/activities/MainActivity.java b/app/src/fdroid/java/fr.gouv.etalab.mastodon/activities/MainActivity.java
index b83eb918e..7ed93c5b5 100644
--- a/app/src/fdroid/java/fr.gouv.etalab.mastodon/activities/MainActivity.java
+++ b/app/src/fdroid/java/fr.gouv.etalab.mastodon/activities/MainActivity.java
@@ -828,7 +828,8 @@ public class MainActivity extends AppCompatActivity
                     while (matcher.find()){
                         int matchStart = matcher.start(1);
                         int matchEnd = matcher.end();
-                        sharedText = sharedText.substring(matchStart, matchEnd);
+                        if(matchStart < matchEnd && sharedText.length() > matchEnd)
+                            sharedText = sharedText.substring(matchStart, matchEnd);
                     }
                     new RetrieveMetaDataAsyncTask(sharedText, MainActivity.this).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
                     Intent intentToot = new Intent(getApplicationContext(), TootActivity.class);
diff --git a/app/src/safetynet/java/fr.gouv.etalab.mastodon/activities/MainActivity.java b/app/src/safetynet/java/fr.gouv.etalab.mastodon/activities/MainActivity.java
index c79c899a1..67434af0a 100644
--- a/app/src/safetynet/java/fr.gouv.etalab.mastodon/activities/MainActivity.java
+++ b/app/src/safetynet/java/fr.gouv.etalab.mastodon/activities/MainActivity.java
@@ -836,7 +836,8 @@ public class MainActivity extends AppCompatActivity
                     while (matcher.find()){
                         int matchStart = matcher.start(1);
                         int matchEnd = matcher.end();
-                        sharedText = sharedText.substring(matchStart, matchEnd);
+                        if(matchStart < matchEnd && sharedText.length() > matchEnd)
+                            sharedText = sharedText.substring(matchStart, matchEnd);
                     }
                     new RetrieveMetaDataAsyncTask(sharedText, MainActivity.this).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
                     Intent intentToot = new Intent(getApplicationContext(), TootActivity.class);