diff --git a/bin/doctor_karma.pl b/bin/doctor_karma.pl
index 6da1844..ea4b6fc 100755
--- a/bin/doctor_karma.pl
+++ b/bin/doctor_karma.pl
@@ -64,19 +64,38 @@ sub process_message_with_text {
         "'$message->{text}' received from $first_name:$log_username:$user_id");
     if ( $text eq '+1' && defined $reply_to_message ) {
         add_karma_to_replied_message_user($message);
+        return;
     }
     if ( $text eq '-1' && defined $reply_to_message ) {
         substract_karma_to_replied_message_user($message);
+        return;
     }
     if ( $text eq '/karma' ) {
         show_karma($message);
+        return;
     }
     if ( $text eq '/doctortop' ) {
         show_top_ten($message);
+        return;
     }
     if ( $text eq '/doctorhate' ) {
         show_top_ten_hate($message);
+        return;
     }
+    if ( $text =~ /^(?:-|\+)\d+$/ ) {
+        error_too_much_karma($message);
+        return;
+    }
+}
+
+sub error_too_much_karma {
+    my $message  = shift;
+    my $chat_id = $message->{chat}{id};
+    
+    $telegram->send_message(
+        chat_id => $chat_id,
+        text    => 'You cannoct substract or add more than 1 of karma.',
+    );
 }
 
 sub show_top_ten_hate {