Version 4.7.6

system/Helpers/Form/Text.php

@@ -246,7 +246,7 @@ class _Text extends TextArea
 				}
 				$return['prefix'] = \IPS\Request::i()->$freechoicePrefix;
 			}
-			elseif ( isset( \IPS\Request::i()->$firstAsPrefix ) and \IPS\Request::i()->$firstAsPrefix )
+			elseif ( isset( \IPS\Request::i()->$firstAsPrefix ) and \IPS\Request::i()->$firstAsPrefix and !empty( $return ) )
 			{
 				$return = array_merge( array( 'prefix' => array_shift( $return ) ), $return );
 			}