Index: lams_central/web/includes/javascript/ckconfig_custom.js
===================================================================
diff -u -rebf117035c692f7069000d6b7bace23cfc94619a -r3bee00de0ff77022b4926789601d86eb5e1d3b97
--- lams_central/web/includes/javascript/ckconfig_custom.js	(.../ckconfig_custom.js)	(revision ebf117035c692f7069000d6b7bace23cfc94619a)
+++ lams_central/web/includes/javascript/ckconfig_custom.js	(.../ckconfig_custom.js)	(revision 3bee00de0ff77022b4926789601d86eb5e1d3b97)
@@ -149,7 +149,9 @@
 	var height = e.editor.config.height;
 	if ( ! height ) {
 		height = "60px";
-	} else if ( height.indexOf("px") == -1 ){
+		
+	// convert to string, just in case it is a number
+	} else if ( ("" + height).indexOf("px") == -1 ){
 		height = height + "px";
 	}
 	e.editor._.editable.$.style.minHeight = height;