Checking whether object exists before calling method on it.

adelura · mlewand · commit cb0abf930492 · 2014-08-19T13:32:42.000+02:00
diff --git a/plugins/undo/plugin.js b/plugins/undo/plugin.js
@@ -898,7 +898,7 @@
 				ieFunctionKeysWorkaround = CKEDITOR.env.ie && keyCode in backspaceOrDelete;
 
 			// IE: backspace/del would still call keypress event, even if nothing was removed.
-			if ( ieFunctionKeysWorkaround && this.lastKeydownImage.equalsContent( new Image( editor, true ) ) ) {
+			if ( ieFunctionKeysWorkaround && this.lastKeydownImage && this.lastKeydownImage.equalsContent( new Image( editor, true ) ) ) {
 				return;
 			}
 

Original file line number	Diff line number	Diff line change
`@@ -898,7 +898,7 @@`
`898`	`898`	`ieFunctionKeysWorkaround = CKEDITOR.env.ie && keyCode in backspaceOrDelete;`
`899`	`899`
`900`	`900`	`// IE: backspace/del would still call keypress event, even if nothing was removed.`
`901`		`- if ( ieFunctionKeysWorkaround && this.lastKeydownImage.equalsContent( new Image( editor, true ) ) ) {`
	`901`	`+ if ( ieFunctionKeysWorkaround && this.lastKeydownImage && this.lastKeydownImage.equalsContent( new Image( editor, true ) ) ) {`
`902`	`902`	`return;`
`903`	`903`	`}`
`904`	`904`