diff --git a/src/emerge.cpp b/src/emerge.cpp
index 8719a9eb3..a3efb09e7 100644
--- a/src/emerge.cpp
+++ b/src/emerge.cpp
@@ -174,6 +174,9 @@ bool EmergeManager::initMapgens(MapgenParams *params)
 
 Mapgen *EmergeManager::getCurrentMapgen()
 {
+	if (!m_threads_active)
+		return NULL;
+
 	for (u32 i = 0; i != m_threads.size(); i++) {
 		if (m_threads[i]->isCurrentThread())
 			return m_threads[i]->m_mapgen;