Fixes #775.

Signal/src/view controllers/MessageComposeTableViewController.m

@@ -299,7 +299,7 @@
         confirmMessage = [confirmMessage stringByAppendingString:NSLocalizedString(@"QUESTIONMARK_PUNCTUATION", @"")];
     }
     
-    __block UIAlertController *alertController = [UIAlertController
+    UIAlertController *alertController = [UIAlertController
                                           alertControllerWithTitle:NSLocalizedString(@"CONFIRMATION_TITLE", @"")
                                           message:confirmMessage
                                           preferredStyle:UIAlertControllerStyleAlert];
@@ -338,7 +338,12 @@
     sendTextButton.hidden = YES;
     self.searchController.searchBar.text = @"";
     
-    [self presentViewController:alertController animated:YES completion:[UIUtil modalCompletionBlock]];
+    [self dismissViewControllerAnimated:YES
+                             completion:nil];
+    
+    [self presentViewController:alertController
+                       animated:YES
+                     completion:[UIUtil modalCompletionBlock]];
 }
 
 #pragma mark - SMS Composer Delegate