Index: lams_central/web/includes/javascript/ckconfig_custom.js
===================================================================
diff -u -r394f403c289f0fd7808c228840bead5c4e7d5d32 -r8d0f4c7a77330dce787d91386809259e47936b35
--- lams_central/web/includes/javascript/ckconfig_custom.js	(.../ckconfig_custom.js)	(revision 394f403c289f0fd7808c228840bead5c4e7d5d32)
+++ lams_central/web/includes/javascript/ckconfig_custom.js	(.../ckconfig_custom.js)	(revision 8d0f4c7a77330dce787d91386809259e47936b35)
@@ -159,7 +159,9 @@
 	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;