Index: lams_tool_mindmap/src/java/org/lamsfoundation/lams/tool/mindmap/web/actions/LearningAction.java
===================================================================
diff -u -rfe3c6b01c7765acf2865496cc3b3e56f66ecde57 -r273bb06dcaa6570ebcef29e88d8a539e5325631a
--- lams_tool_mindmap/src/java/org/lamsfoundation/lams/tool/mindmap/web/actions/LearningAction.java	(.../LearningAction.java)	(revision fe3c6b01c7765acf2865496cc3b3e56f66ecde57)
+++ lams_tool_mindmap/src/java/org/lamsfoundation/lams/tool/mindmap/web/actions/LearningAction.java	(.../LearningAction.java)	(revision 273bb06dcaa6570ebcef29e88d8a539e5325631a)
@@ -811,7 +811,7 @@
 		    mindmapService.updateEntry(entry);
 		}
 	    } else {
-		if (!mindmap.isMultiUserMode())
+		if (!mindmap.isMultiUserMode() && learningForm.getMindmapContent() != null)
 		    saveMindmapXML(mindmap, mindmapUser, learningForm.getMindmapContent(), mindmapSession);
 	    }