diff --git a/src/dthinker.cpp b/src/dthinker.cpp
index 1744834674..cb221898e9 100644
--- a/src/dthinker.cpp
+++ b/src/dthinker.cpp
@@ -367,7 +367,7 @@ void DThinker::ChangeStatNum (int statnum)
 {
 	FThinkerList *list;
 
-	Level = currentSession->Levelinfo[0];	// fixme later.
+	Level = currentSession == nullptr ? nullptr : currentSession->Levelinfo[0];	// fixme later.
 
 	if ((unsigned)statnum > MAX_STATNUM)
 	{