1 files changed, 16 insertions, 9 deletions

diff --git a/MLEB/Translate/resources/js/ext.translate.special.pagepreparation.js b/MLEB/Translate/resources/js/ext.translate.special.pagepreparation.js
index 03c4385d..b32008fe 100644
--- a/MLEB/Translate/resources/js/ext.translate.special.pagepreparation.js
+++ b/MLEB/Translate/resources/js/ext.translate.special.pagepreparation.js
@@ -45,7 +45,9 @@
 				obj = data.query.pages[ page ];
 			}
 
-			diff = obj.revisions[ 0 ].diff[ '*' ];
+			if ( obj !== undefined ) {
+				diff = obj.revisions[ 0 ].diff[ '*' ];
+			}
 
 			return diff;
 		} );
@@ -91,7 +93,7 @@
 
 			aliases.push( 'category' );
 			for ( i = 0; i < aliases.length; i++ ) {
-				aliases[ i ] = mw.RegExp.escape( aliases[ i ] );
+				aliases[ i ] = mw.util.escapeRegExp( aliases[ i ] );
 			}
 
 			aliasList = aliases.join( '|' );
@@ -360,11 +362,11 @@
 		var pageContent,
 			$input = $( '#page' );
 
-		$( '#action-cancel' ).click( function () {
+		$( '#action-cancel' ).on( 'click', function () {
 			document.location.reload( true );
 		} );
 
-		$( '#action-save' ).click( function () {
+		$( '#action-save' ).on( 'click', function () {
 			var pageName,
 				pageUrl = '';
 
@@ -383,11 +385,11 @@
 			} );
 		} );
 
-		$( '#action-prepare' ).click( function () {
-			var pageName, messageDiv = $( '.messageDiv' );
+		$( '#action-prepare' ).on( 'click', function () {
+			var pageName, $messageDiv = $( '.messageDiv' );
 
 			pageName = $input.val().trim();
-			messageDiv.hide();
+			$messageDiv.hide();
 			if ( pageName === '' ) {
 				// eslint-disable-next-line no-alert
 				alert( mw.msg( 'pp-pagename-missing' ) );
@@ -407,15 +409,20 @@
 					pageContent = postPreparationCleanup( pageContent );
 					pageContent = pageContent.trim();
 					getDiff( pageName, pageContent ).done( function ( diff ) {
+						if ( diff === undefined ) {
+							$messageDiv.text( mw.msg( 'pp-diff-error' ) ).show();
+							return;
+						}
+
 						$( '.diff tbody' ).append( diff );
 						$( '.divDiff' ).show( 'fast' );
 						if ( diff !== '' ) {
-							messageDiv.text( mw.msg( 'pp-prepare-message' ) ).show();
+							$messageDiv.text( mw.msg( 'pp-prepare-message' ) ).show();
 							$( '#action-prepare' ).hide();
 							$( '#action-save' ).show();
 							$( '#action-cancel' ).show();
 						} else {
-							messageDiv.text( mw.msg( 'pp-already-prepared-message' ) ).show();
+							$messageDiv.text( mw.msg( 'pp-already-prepared-message' ) ).show();
 						}
 					} );
 				} );