diff --git a/indra/newview/llfloaterpreference.cpp b/indra/newview/llfloaterpreference.cpp
index 2eadd40bfaaeda14ff5095d893cc23b6ff98ed5c..08d82bfd95cacd904d5fb4fa23891a317ea38dc6 100755
--- a/indra/newview/llfloaterpreference.cpp
+++ b/indra/newview/llfloaterpreference.cpp
@@ -1998,6 +1998,12 @@ void LLPanelPreference::cancel()
 	{
 		LLControlVariable* control = iter->first;
 		LLSD ctrl_value = iter->second;
+
+		if((control->getName() == "InstantMessageLogPath") && (ctrl_value.asString() == ""))
+		{
+			continue;
+		}
+
 		control->set(ctrl_value);
 	}