avoid crashing when accessing mapgen early (#5384)

diff --git a/src/emerge.cpp b/src/emerge.cpp
index 8719a9eb37c9d0719db9d8af789d7784c5bd3207..a3efb09e78fd4190a98ace1cd8ad683b9591b7ac 100644 (file)
--- 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;